<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@vertical+block@cf8cc97e8fd2484087fd8b8aef9c0d34" data-init="VerticalStudentView" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="vertical" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<h2 class="hd hd-2 unit-title">Recombination and Generation</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3">
<div class="xblock xblock-public_view xblock-public_view-video xmodule_display xmodule_VideoBlock" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3" data-init="XBlockToXModuleShim" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="video" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Video"}
</script>
<h3 class="hd hd-2">Recombination and Generation</h3>
<div
id="video_d5428f9be8614d0092cc92941c44c3b3"
class="video closed"
data-metadata='{"speed": null, "publishCompletionUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/publish_completion", "streams": "1.00:ZtT73fCr7gM", "prioritizeHls": false, "completionEnabled": false, "autoAdvance": false, "captionDataDir": null, "transcriptLanguages": {"en": "English"}, "recordedYoutubeIsAvailable": true, "showCaptions": "true", "completionPercentage": 0.95, "saveStateUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/xmodule_handler/save_user_state", "ytMetadataEndpoint": "", "duration": 565.43, "autohideHtml5": false, "transcriptLanguage": "en", "ytApiUrl": "https://www.youtube.com/iframe_api", "lmsRootURL": "https://openlearninglibrary.mit.edu", "sources": ["https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000700_DTH.webm", "https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000700_DTH.mp4", "https://d2f1egay8yehza.cloudfront.net/MIT315XXT115-V000700/MIT315XXT115-V000700.m3u8"], "transcriptAvailableTranslationsUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/transcript/available_translations", "savedVideoPosition": 0.0, "transcriptTranslationUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/transcript/translation/__lang__", "saveStateEnabled": false, "ytTestTimeout": 1500, "poster": "https://mitx-edx-video-meta-storage.s3.amazonaws.com/media/video-images/e63a150ab4c24c09be10222db98638fe.jpeg?Expires=1713598810&x-amz-security-token=IQoJb3JpZ2luX2VjEOD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJGMEQCIHQIw3J3UOnoE4Q5wwRHFR5%2Bj065PdFPFVnfNNrP0Fa3AiA4uBU818zNY%2FLNDM68kVKIGEeBE0pk%2BXgYbSe13lAWWCq7BQgpEAMaDDg1OTIwNTYzNzQxMSIMSWXRf0yWHOj14dodKpgFy5i6D8u%2F1Kmpwb3xtv7mTgRXvRkuwxSSvJ5uzl%2FJoGkIE%2FxtThCLy2xOJGYs1UXIvsLFW5LOF0A%2FzY%2BCILXGLB1UIGxwcW%2BdE2TrKGQ8YvXx4WDajyHSmYbuBKqzzrowcqnXOP9pQ%2BOWY3mytLdNjab%2BuhVBKy%2FvY3KEzaHNHmY%2FYM1c5CdMpBvU1M4f0GLBodW39zr7u8klGcUvEnydcodctVpGEpSR5kN8%2FzFEygN0S5538JORwR%2BDhK7X3wnKBkr%2Ffoi44xlYt5ma%2BAybEUKwRLBJUskXnasnYEy1bjH2kby1oiiFzoorMDfge38BBrgJ2yKylqSTDN4nfULHxM3PBSxBFk0KqRJkkIS9Gu%2FCfqycIhIZuAxIs0UN%2FohxIO1%2BN5D5%2BRUYAQL9luh%2B4tzkXYy5kchHnKVNhO44B1MxeCo1E1VY7n4RLGM3viY1YROckBXSSCWrEUjwXwf4QcnTWvxNBznUtEunfiGAd6mzA2OMrAeG1p2y8Lgu594xSGrbIUONjT%2Blr%2F3ib0gURtZTt4pCjVAuNajeJothRwZk0WZxnLUPIoe4%2F%2BWWsfWkFiXYlnGSU9S7%2BO0zkQWlPWD59YEWwD6cUUWWFR3MzIJ4zs7uv%2B6E2Y5ZNSNoIlSQzYx06cLlk02z0WdgjtMmsBMZBt3P3eLGZWlKh75DesvISiA3BnuLoE6SBVPzYDXPjaYffZiJqzGcIVN%2BFCiF3G6DYrqTmHpDGh%2BXRtLlKmez9E4t8xobX7Ugs6oBwZgLfsg32ztvLfVh2oNRXxYOlh47FwDJHPUDBpsG7dXqRK4uiUPdHCymogvcM1j4i1qhtWFccOdQdhPYM5pPjJCK6p9UvpVA5Y38eL3bTzRUZWvm3lPTGIl4ZTD13Y2xBjqyAQceaj7zv2f4OwNTWQBm2eYIYpJivk07EAwwl0ac2mS0A6aX8nxnZ6WdHQhzX1W2lF65XxHk%2FFWiP5HcLplrITha3gLcorWBhhMlllU7n8ZwtjRSe%2BNYjUbkpl3Bnzi5iP6W3trMlch9KkZuA5SsFLkCyl%2BqAlT%2BqLN%2Bn1fCBk%2BqWT0MspWrDeaHX18Z4OZJVRf8CPvkzgwrsw2hndZQafNFsYjzsLomdlOtoOrJqm%2BrTuE%3D&Signature=bflnld%2FfGsXXMNTMpoSp%2Fb6X3Ms%3D&AWSAccessKeyId=ASIA4QDFFSURSWTO7G5I", "autoplay": false, "generalSpeed": 1.0, "start": 0.0, "end": 0.0}'
data-bumper-metadata='null'
data-autoadvance-enabled="False"
data-poster='null'
tabindex="-1"
>
<div class="focus_grabber first"></div>
<div class="tc-wrapper">
<div class="video-wrapper">
<span tabindex="0" class="spinner" aria-hidden="false" aria-label="Loading video player"></span>
<span tabindex="-1" class="btn-play fa fa-youtube-play fa-2x is-hidden" aria-hidden="true" aria-label="Play video"></span>
<div class="video-player-pre"></div>
<div class="video-player">
<div id="d5428f9be8614d0092cc92941c44c3b3"></div>
<h4 class="hd hd-4 video-error is-hidden">No playable video sources found.</h4>
<h4 class="hd hd-4 video-hls-error is-hidden">
Your browser does not support this video format. Try using a different browser.
</h4>
</div>
<div class="video-player-post"></div>
<div class="closed-captions"></div>
<div class="video-controls is-hidden">
<div>
<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
<div class="secondary-controls"></div>
</div>
</div>
</div>
</div>
<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_d5428f9be8614d0092cc92941c44c3b3">Downloads and transcripts</h3>
<div class="wrapper-downloads" role="region" aria-labelledby="video-download-transcripts_d5428f9be8614d0092cc92941c44c3b3">
<div class="wrapper-download-transcripts">
<h4 class="hd hd-5">Transcripts</h4>
<ul class="list-download-transcripts">
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
</li>
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d5428f9be8614d0092cc92941c44c3b3/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@vertical+block@e0df0263bdb74edd970b7d5d309504bc" data-init="VerticalStudentView" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="vertical" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<h2 class="hd hd-2 unit-title">In-Lecture Question 2.3</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4">
<div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4" data-init="XBlockToXModuleShim" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="problem" data-has-score="True" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Problem"}
</script>
<div id="problem_18165ed59e2b4cfa9704786ffcaf95e4" class="problems-wrapper" role="group"
aria-labelledby="18165ed59e2b4cfa9704786ffcaf95e4-problem-title"
data-problem-id="block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4" data-url="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4/handler/xmodule_handler"
data-problem-score="0"
data-problem-total-possible="0"
data-attempts-used="0"
data-content="
<h3 class="hd hd-3 problem-header" id="18165ed59e2b4cfa9704786ffcaf95e4-problem-title" aria-describedby="block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4-problem-progress" tabindex="-1">
In-Lecture Question 2.3
</h3>
<div class="problem-progress" id="block-v1:MITX+3.15.1x+2T2017+type@problem+block@18165ed59e2b4cfa9704786ffcaf95e4-problem-progress"></div>
<div class="problem">
<div>
<span id="anchor_change_my_id_for_each_one_on_the_page"/>
<script type="text/javascript">
/* The object here is to replace the single line input with a textarea */
(function() {
var elem = $("#anchor_change_my_id_for_each_one_on_the_page")
.closest("div.problem")
.find(":text");
/* There's CSS in the LMS that controls the height, so we have to override here */
var textarea = $('<textarea style="height:150px" rows="20" cols="70"/>');
console.log(elem);
console.log(textarea);
//This is just a way to do an iterator in JS
for (attrib in {'id':null, 'name':null}) {
textarea.attr(attrib, elem.attr(attrib));
}
/* copy over the submitted value */
textarea.val(elem.val())
elem.replaceWith(textarea);
})();
</script>
<p>For very pure silicon, the carrier recombination time is \(1ms\). When Au is present in a concentration of \(10^{15} cm^{-3}\), the recombination time is \(1 \mu s\). Why does gold change the recombination time?</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div id="inputtype_18165ed59e2b4cfa9704786ffcaf95e4_2_1" class=" capa_inputtype textline">
<div class="unanswered ">
<input type="text" name="input_18165ed59e2b4cfa9704786ffcaf95e4_2_1" id="input_18165ed59e2b4cfa9704786ffcaf95e4_2_1" aria-describedby="status_18165ed59e2b4cfa9704786ffcaf95e4_2_1" value=""/>
<span class="trailing_text" id="trailing_text_18165ed59e2b4cfa9704786ffcaf95e4_2_1"/>
<span class="status unanswered" id="status_18165ed59e2b4cfa9704786ffcaf95e4_2_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
</span>
<p id="answer_18165ed59e2b4cfa9704786ffcaf95e4_2_1" class="answer"/>
</div>
</div></div>
<div class="solution-span">
<span id="solution_18165ed59e2b4cfa9704786ffcaf95e4_solution_1"/>
</div></div>
<div class="action">
<input type="hidden" name="problem_id" value="In-Lecture Question 2.3" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_18165ed59e2b4cfa9704786ffcaf95e4" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_18165ed59e2b4cfa9704786ffcaf95e4">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="18165ed59e2b4cfa9704786ffcaf95e4-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="18165ed59e2b4cfa9704786ffcaf95e4-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="18165ed59e2b4cfa9704786ffcaf95e4-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="False">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@vertical+block@da66e10b7304441ab28bd28fe1d939c9" data-init="VerticalStudentView" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="vertical" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<h2 class="hd hd-2 unit-title">Time Dependence of Carrier Concentration</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0">
<div class="xblock xblock-public_view xblock-public_view-video xmodule_display xmodule_VideoBlock" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0" data-init="XBlockToXModuleShim" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="video" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Video"}
</script>
<h3 class="hd hd-2">Time Dependence of Carrier Concentration</h3>
<div
id="video_6c6835e87d1a4fc8bdeb0c727881b8d0"
class="video closed"
data-metadata='{"speed": null, "publishCompletionUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/publish_completion", "streams": "1.00:7AJwtbJSGCY", "prioritizeHls": false, "completionEnabled": false, "autoAdvance": false, "captionDataDir": null, "transcriptLanguages": {"en": "English"}, "recordedYoutubeIsAvailable": true, "showCaptions": "true", "completionPercentage": 0.95, "saveStateUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/xmodule_handler/save_user_state", "ytMetadataEndpoint": "", "duration": 452.07, "autohideHtml5": false, "transcriptLanguage": "en", "ytApiUrl": "https://www.youtube.com/iframe_api", "lmsRootURL": "https://openlearninglibrary.mit.edu", "sources": ["https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V003400_DTH.webm", "https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V003400_DTH.mp4", "https://d2f1egay8yehza.cloudfront.net/MIT315XXT115-V003400/MIT315XXT115-V003400.m3u8"], "transcriptAvailableTranslationsUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/transcript/available_translations", "savedVideoPosition": 0.0, "transcriptTranslationUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/transcript/translation/__lang__", "saveStateEnabled": false, "ytTestTimeout": 1500, "poster": "https://mitx-edx-video-meta-storage.s3.amazonaws.com/media/video-images/1c868956b11944f58602657dcd3acb50.jpeg?Expires=1713598811&x-amz-security-token=IQoJb3JpZ2luX2VjEOD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJGMEQCIHQIw3J3UOnoE4Q5wwRHFR5%2Bj065PdFPFVnfNNrP0Fa3AiA4uBU818zNY%2FLNDM68kVKIGEeBE0pk%2BXgYbSe13lAWWCq7BQgpEAMaDDg1OTIwNTYzNzQxMSIMSWXRf0yWHOj14dodKpgFy5i6D8u%2F1Kmpwb3xtv7mTgRXvRkuwxSSvJ5uzl%2FJoGkIE%2FxtThCLy2xOJGYs1UXIvsLFW5LOF0A%2FzY%2BCILXGLB1UIGxwcW%2BdE2TrKGQ8YvXx4WDajyHSmYbuBKqzzrowcqnXOP9pQ%2BOWY3mytLdNjab%2BuhVBKy%2FvY3KEzaHNHmY%2FYM1c5CdMpBvU1M4f0GLBodW39zr7u8klGcUvEnydcodctVpGEpSR5kN8%2FzFEygN0S5538JORwR%2BDhK7X3wnKBkr%2Ffoi44xlYt5ma%2BAybEUKwRLBJUskXnasnYEy1bjH2kby1oiiFzoorMDfge38BBrgJ2yKylqSTDN4nfULHxM3PBSxBFk0KqRJkkIS9Gu%2FCfqycIhIZuAxIs0UN%2FohxIO1%2BN5D5%2BRUYAQL9luh%2B4tzkXYy5kchHnKVNhO44B1MxeCo1E1VY7n4RLGM3viY1YROckBXSSCWrEUjwXwf4QcnTWvxNBznUtEunfiGAd6mzA2OMrAeG1p2y8Lgu594xSGrbIUONjT%2Blr%2F3ib0gURtZTt4pCjVAuNajeJothRwZk0WZxnLUPIoe4%2F%2BWWsfWkFiXYlnGSU9S7%2BO0zkQWlPWD59YEWwD6cUUWWFR3MzIJ4zs7uv%2B6E2Y5ZNSNoIlSQzYx06cLlk02z0WdgjtMmsBMZBt3P3eLGZWlKh75DesvISiA3BnuLoE6SBVPzYDXPjaYffZiJqzGcIVN%2BFCiF3G6DYrqTmHpDGh%2BXRtLlKmez9E4t8xobX7Ugs6oBwZgLfsg32ztvLfVh2oNRXxYOlh47FwDJHPUDBpsG7dXqRK4uiUPdHCymogvcM1j4i1qhtWFccOdQdhPYM5pPjJCK6p9UvpVA5Y38eL3bTzRUZWvm3lPTGIl4ZTD13Y2xBjqyAQceaj7zv2f4OwNTWQBm2eYIYpJivk07EAwwl0ac2mS0A6aX8nxnZ6WdHQhzX1W2lF65XxHk%2FFWiP5HcLplrITha3gLcorWBhhMlllU7n8ZwtjRSe%2BNYjUbkpl3Bnzi5iP6W3trMlch9KkZuA5SsFLkCyl%2BqAlT%2BqLN%2Bn1fCBk%2BqWT0MspWrDeaHX18Z4OZJVRf8CPvkzgwrsw2hndZQafNFsYjzsLomdlOtoOrJqm%2BrTuE%3D&Signature=Rapv%2BjyuTuKbXQ2pDMqy3ewuB%2B0%3D&AWSAccessKeyId=ASIA4QDFFSURSWTO7G5I", "autoplay": false, "generalSpeed": 1.0, "start": 0.0, "end": 0.0}'
data-bumper-metadata='null'
data-autoadvance-enabled="False"
data-poster='null'
tabindex="-1"
>
<div class="focus_grabber first"></div>
<div class="tc-wrapper">
<div class="video-wrapper">
<span tabindex="0" class="spinner" aria-hidden="false" aria-label="Loading video player"></span>
<span tabindex="-1" class="btn-play fa fa-youtube-play fa-2x is-hidden" aria-hidden="true" aria-label="Play video"></span>
<div class="video-player-pre"></div>
<div class="video-player">
<div id="6c6835e87d1a4fc8bdeb0c727881b8d0"></div>
<h4 class="hd hd-4 video-error is-hidden">No playable video sources found.</h4>
<h4 class="hd hd-4 video-hls-error is-hidden">
Your browser does not support this video format. Try using a different browser.
</h4>
</div>
<div class="video-player-post"></div>
<div class="closed-captions"></div>
<div class="video-controls is-hidden">
<div>
<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
<div class="secondary-controls"></div>
</div>
</div>
</div>
</div>
<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_6c6835e87d1a4fc8bdeb0c727881b8d0">Downloads and transcripts</h3>
<div class="wrapper-downloads" role="region" aria-labelledby="video-download-transcripts_6c6835e87d1a4fc8bdeb0c727881b8d0">
<div class="wrapper-download-transcripts">
<h4 class="hd hd-5">Transcripts</h4>
<ul class="list-download-transcripts">
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
</li>
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@6c6835e87d1a4fc8bdeb0c727881b8d0/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@vertical+block@216737aeefb14e94b75fcb6dd7a6a3b0" data-init="VerticalStudentView" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="vertical" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<h2 class="hd hd-2 unit-title">Position Dependence of Carrier Concentration at Steady State</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4">
<div class="xblock xblock-public_view xblock-public_view-video xmodule_display xmodule_VideoBlock" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4" data-init="XBlockToXModuleShim" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="video" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Video"}
</script>
<h3 class="hd hd-2">Position Dependence of Carrier Concentration at Steady State</h3>
<div
id="video_d71b73a6cf744f9e9a51d199a56647f4"
class="video closed"
data-metadata='{"speed": null, "publishCompletionUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/publish_completion", "streams": "1.00:p18X63NvkRI", "prioritizeHls": false, "completionEnabled": false, "autoAdvance": false, "captionDataDir": null, "transcriptLanguages": {"en": "English"}, "recordedYoutubeIsAvailable": true, "showCaptions": "true", "completionPercentage": 0.95, "saveStateUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/xmodule_handler/save_user_state", "ytMetadataEndpoint": "", "duration": 691.37, "autohideHtml5": false, "transcriptLanguage": "en", "ytApiUrl": "https://www.youtube.com/iframe_api", "lmsRootURL": "https://openlearninglibrary.mit.edu", "sources": ["https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000800_DTH.webm", "https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000800_DTH.mp4", "https://d2f1egay8yehza.cloudfront.net/MIT315XXT115-V000800/MIT315XXT115-V000800.m3u8"], "transcriptAvailableTranslationsUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/transcript/available_translations", "savedVideoPosition": 0.0, "transcriptTranslationUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/transcript/translation/__lang__", "saveStateEnabled": false, "ytTestTimeout": 1500, "poster": "https://mitx-edx-video-meta-storage.s3.amazonaws.com/media/video-images/9bc3a06ca9b549688bf9c491ba420321.jpeg?Expires=1713598811&x-amz-security-token=IQoJb3JpZ2luX2VjEOD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJGMEQCIHQIw3J3UOnoE4Q5wwRHFR5%2Bj065PdFPFVnfNNrP0Fa3AiA4uBU818zNY%2FLNDM68kVKIGEeBE0pk%2BXgYbSe13lAWWCq7BQgpEAMaDDg1OTIwNTYzNzQxMSIMSWXRf0yWHOj14dodKpgFy5i6D8u%2F1Kmpwb3xtv7mTgRXvRkuwxSSvJ5uzl%2FJoGkIE%2FxtThCLy2xOJGYs1UXIvsLFW5LOF0A%2FzY%2BCILXGLB1UIGxwcW%2BdE2TrKGQ8YvXx4WDajyHSmYbuBKqzzrowcqnXOP9pQ%2BOWY3mytLdNjab%2BuhVBKy%2FvY3KEzaHNHmY%2FYM1c5CdMpBvU1M4f0GLBodW39zr7u8klGcUvEnydcodctVpGEpSR5kN8%2FzFEygN0S5538JORwR%2BDhK7X3wnKBkr%2Ffoi44xlYt5ma%2BAybEUKwRLBJUskXnasnYEy1bjH2kby1oiiFzoorMDfge38BBrgJ2yKylqSTDN4nfULHxM3PBSxBFk0KqRJkkIS9Gu%2FCfqycIhIZuAxIs0UN%2FohxIO1%2BN5D5%2BRUYAQL9luh%2B4tzkXYy5kchHnKVNhO44B1MxeCo1E1VY7n4RLGM3viY1YROckBXSSCWrEUjwXwf4QcnTWvxNBznUtEunfiGAd6mzA2OMrAeG1p2y8Lgu594xSGrbIUONjT%2Blr%2F3ib0gURtZTt4pCjVAuNajeJothRwZk0WZxnLUPIoe4%2F%2BWWsfWkFiXYlnGSU9S7%2BO0zkQWlPWD59YEWwD6cUUWWFR3MzIJ4zs7uv%2B6E2Y5ZNSNoIlSQzYx06cLlk02z0WdgjtMmsBMZBt3P3eLGZWlKh75DesvISiA3BnuLoE6SBVPzYDXPjaYffZiJqzGcIVN%2BFCiF3G6DYrqTmHpDGh%2BXRtLlKmez9E4t8xobX7Ugs6oBwZgLfsg32ztvLfVh2oNRXxYOlh47FwDJHPUDBpsG7dXqRK4uiUPdHCymogvcM1j4i1qhtWFccOdQdhPYM5pPjJCK6p9UvpVA5Y38eL3bTzRUZWvm3lPTGIl4ZTD13Y2xBjqyAQceaj7zv2f4OwNTWQBm2eYIYpJivk07EAwwl0ac2mS0A6aX8nxnZ6WdHQhzX1W2lF65XxHk%2FFWiP5HcLplrITha3gLcorWBhhMlllU7n8ZwtjRSe%2BNYjUbkpl3Bnzi5iP6W3trMlch9KkZuA5SsFLkCyl%2BqAlT%2BqLN%2Bn1fCBk%2BqWT0MspWrDeaHX18Z4OZJVRf8CPvkzgwrsw2hndZQafNFsYjzsLomdlOtoOrJqm%2BrTuE%3D&Signature=FZXZoCzZIes7jZjrYIGLOyPdB4w%3D&AWSAccessKeyId=ASIA4QDFFSURSWTO7G5I", "autoplay": false, "generalSpeed": 1.0, "start": 0.0, "end": 0.0}'
data-bumper-metadata='null'
data-autoadvance-enabled="False"
data-poster='null'
tabindex="-1"
>
<div class="focus_grabber first"></div>
<div class="tc-wrapper">
<div class="video-wrapper">
<span tabindex="0" class="spinner" aria-hidden="false" aria-label="Loading video player"></span>
<span tabindex="-1" class="btn-play fa fa-youtube-play fa-2x is-hidden" aria-hidden="true" aria-label="Play video"></span>
<div class="video-player-pre"></div>
<div class="video-player">
<div id="d71b73a6cf744f9e9a51d199a56647f4"></div>
<h4 class="hd hd-4 video-error is-hidden">No playable video sources found.</h4>
<h4 class="hd hd-4 video-hls-error is-hidden">
Your browser does not support this video format. Try using a different browser.
</h4>
</div>
<div class="video-player-post"></div>
<div class="closed-captions"></div>
<div class="video-controls is-hidden">
<div>
<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
<div class="secondary-controls"></div>
</div>
</div>
</div>
</div>
<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_d71b73a6cf744f9e9a51d199a56647f4">Downloads and transcripts</h3>
<div class="wrapper-downloads" role="region" aria-labelledby="video-download-transcripts_d71b73a6cf744f9e9a51d199a56647f4">
<div class="wrapper-download-transcripts">
<h4 class="hd hd-5">Transcripts</h4>
<ul class="list-download-transcripts">
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
</li>
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@d71b73a6cf744f9e9a51d199a56647f4/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="xblock xblock-public_view xblock-public_view-vertical" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@vertical+block@42db9d1e556a403e89044c5a5aef835d" data-init="VerticalStudentView" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="vertical" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<h2 class="hd hd-2 unit-title">Crystal Colors and Summary</h2>
<div class="vert-mod">
<div class="vert vert-0" data-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834">
<div class="xblock xblock-public_view xblock-public_view-video xmodule_display xmodule_VideoBlock" data-runtime-class="LmsRuntime" data-usage-id="block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834" data-init="XBlockToXModuleShim" data-runtime-version="1" data-course-id="course-v1:MITX+3.15.1x+2T2017" data-block-type="video" data-has-score="False" data-graded="False" data-request-token="846f69e8fee811ee9bc316fff75c5923">
<script type="json/xblock-args" class="xblock-json-init-args">
{"xmodule-type": "Video"}
</script>
<h3 class="hd hd-2">Crystal Colors and Summary</h3>
<div
id="video_b922a0fec32b4ac49e671d583f01c834"
class="video closed"
data-metadata='{"speed": null, "publishCompletionUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/publish_completion", "streams": "1.00:5q101AFsJQA", "prioritizeHls": false, "completionEnabled": false, "autoAdvance": false, "captionDataDir": null, "transcriptLanguages": {"en": "English"}, "recordedYoutubeIsAvailable": true, "showCaptions": "true", "completionPercentage": 0.95, "saveStateUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/xmodule_handler/save_user_state", "ytMetadataEndpoint": "", "duration": 246.0, "autohideHtml5": false, "transcriptLanguage": "en", "ytApiUrl": "https://www.youtube.com/iframe_api", "lmsRootURL": "https://openlearninglibrary.mit.edu", "sources": ["https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000900_DTH.webm", "https://d2f1egay8yehza.cloudfront.net/MIT315XX/MIT315XXT115-V000900_DTH.mp4", "https://d2f1egay8yehza.cloudfront.net/MIT315XXT115-V000900/MIT315XXT115-V000900.m3u8"], "transcriptAvailableTranslationsUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/transcript/available_translations", "savedVideoPosition": 0.0, "transcriptTranslationUrl": "/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/transcript/translation/__lang__", "saveStateEnabled": false, "ytTestTimeout": 1500, "poster": "https://mitx-edx-video-meta-storage.s3.amazonaws.com/media/video-images/27833887af974413adc6f809c1c8dc83.jpeg?Expires=1713598811&x-amz-security-token=IQoJb3JpZ2luX2VjEOD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJGMEQCIHQIw3J3UOnoE4Q5wwRHFR5%2Bj065PdFPFVnfNNrP0Fa3AiA4uBU818zNY%2FLNDM68kVKIGEeBE0pk%2BXgYbSe13lAWWCq7BQgpEAMaDDg1OTIwNTYzNzQxMSIMSWXRf0yWHOj14dodKpgFy5i6D8u%2F1Kmpwb3xtv7mTgRXvRkuwxSSvJ5uzl%2FJoGkIE%2FxtThCLy2xOJGYs1UXIvsLFW5LOF0A%2FzY%2BCILXGLB1UIGxwcW%2BdE2TrKGQ8YvXx4WDajyHSmYbuBKqzzrowcqnXOP9pQ%2BOWY3mytLdNjab%2BuhVBKy%2FvY3KEzaHNHmY%2FYM1c5CdMpBvU1M4f0GLBodW39zr7u8klGcUvEnydcodctVpGEpSR5kN8%2FzFEygN0S5538JORwR%2BDhK7X3wnKBkr%2Ffoi44xlYt5ma%2BAybEUKwRLBJUskXnasnYEy1bjH2kby1oiiFzoorMDfge38BBrgJ2yKylqSTDN4nfULHxM3PBSxBFk0KqRJkkIS9Gu%2FCfqycIhIZuAxIs0UN%2FohxIO1%2BN5D5%2BRUYAQL9luh%2B4tzkXYy5kchHnKVNhO44B1MxeCo1E1VY7n4RLGM3viY1YROckBXSSCWrEUjwXwf4QcnTWvxNBznUtEunfiGAd6mzA2OMrAeG1p2y8Lgu594xSGrbIUONjT%2Blr%2F3ib0gURtZTt4pCjVAuNajeJothRwZk0WZxnLUPIoe4%2F%2BWWsfWkFiXYlnGSU9S7%2BO0zkQWlPWD59YEWwD6cUUWWFR3MzIJ4zs7uv%2B6E2Y5ZNSNoIlSQzYx06cLlk02z0WdgjtMmsBMZBt3P3eLGZWlKh75DesvISiA3BnuLoE6SBVPzYDXPjaYffZiJqzGcIVN%2BFCiF3G6DYrqTmHpDGh%2BXRtLlKmez9E4t8xobX7Ugs6oBwZgLfsg32ztvLfVh2oNRXxYOlh47FwDJHPUDBpsG7dXqRK4uiUPdHCymogvcM1j4i1qhtWFccOdQdhPYM5pPjJCK6p9UvpVA5Y38eL3bTzRUZWvm3lPTGIl4ZTD13Y2xBjqyAQceaj7zv2f4OwNTWQBm2eYIYpJivk07EAwwl0ac2mS0A6aX8nxnZ6WdHQhzX1W2lF65XxHk%2FFWiP5HcLplrITha3gLcorWBhhMlllU7n8ZwtjRSe%2BNYjUbkpl3Bnzi5iP6W3trMlch9KkZuA5SsFLkCyl%2BqAlT%2BqLN%2Bn1fCBk%2BqWT0MspWrDeaHX18Z4OZJVRf8CPvkzgwrsw2hndZQafNFsYjzsLomdlOtoOrJqm%2BrTuE%3D&Signature=91TRDgMj1w5H17iQkmYTgRM0FtA%3D&AWSAccessKeyId=ASIA4QDFFSURSWTO7G5I", "autoplay": false, "generalSpeed": 1.0, "start": 0.0, "end": 0.0}'
data-bumper-metadata='null'
data-autoadvance-enabled="False"
data-poster='null'
tabindex="-1"
>
<div class="focus_grabber first"></div>
<div class="tc-wrapper">
<div class="video-wrapper">
<span tabindex="0" class="spinner" aria-hidden="false" aria-label="Loading video player"></span>
<span tabindex="-1" class="btn-play fa fa-youtube-play fa-2x is-hidden" aria-hidden="true" aria-label="Play video"></span>
<div class="video-player-pre"></div>
<div class="video-player">
<div id="b922a0fec32b4ac49e671d583f01c834"></div>
<h4 class="hd hd-4 video-error is-hidden">No playable video sources found.</h4>
<h4 class="hd hd-4 video-hls-error is-hidden">
Your browser does not support this video format. Try using a different browser.
</h4>
</div>
<div class="video-player-post"></div>
<div class="closed-captions"></div>
<div class="video-controls is-hidden">
<div>
<div class="vcr"><div class="vidtime">0:00 / 0:00</div></div>
<div class="secondary-controls"></div>
</div>
</div>
</div>
</div>
<div class="focus_grabber last"></div>
<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_b922a0fec32b4ac49e671d583f01c834">Downloads and transcripts</h3>
<div class="wrapper-downloads" role="region" aria-labelledby="video-download-transcripts_b922a0fec32b4ac49e671d583f01c834">
<div class="wrapper-download-transcripts">
<h4 class="hd hd-5">Transcripts</h4>
<ul class="list-download-transcripts">
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
</li>
<li class="transcript-option">
<a class="btn btn-link" href="/courses/course-v1:MITX+3.15.1x+2T2017/xblock/block-v1:MITX+3.15.1x+2T2017+type@video+block@b922a0fec32b4ac49e671d583f01c834/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
© All Rights Reserved