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href='/jichu/Index.html'>基礎(chǔ)入門</a> >> <a class='LinkPath' href='/jichu/semiconductor/Index.html'>半導(dǎo)體技術(shù)</a> >> 正文</div></form> <div id="elpqrsb" class="clearfix wrap layout-cols2"> <div id="zzequve" class=col1> <div class="qmjckhb" id=news> <h1>pn結(jié)的單向?qū)щ娦杂惺裁醋饔?/h1><div class="pohiuzp" id=ggt><script language='javascript' src='/myxin/200806/page.js'></script></div> <div id="qiqjgwb" class=times>作者：佚名文章來源：本站原創(chuàng) 點(diǎn)擊數(shù)：<script language='javascript' src='/jichu/GetHits.asp?ArticleID=6399'></script> 更新時間：2020/7/18</div> <div id="kuvkwbc" class=content id=textbody> <P style="TEXT-INDENT: 2em">PN結(jié)加正向電壓時，可以有較大的正向擴(kuò)散電流，即呈現(xiàn)低電阻，我們稱PN結(jié)導(dǎo)通； PN結(jié)加反向電壓時，只有很小的反向漂移電流，呈現(xiàn)高電阻，我們稱PN結(jié)截止。這就是PN結(jié)的單向?qū)щ娦浴?/P> <P style="TEXT-INDENT: 2em">在PN結(jié)沒有外加電壓時．PN結(jié)中載流子的擴(kuò)散運(yùn)動和漂移運(yùn)動達(dá)到動態(tài)平衡，所以通過PN結(jié)的總電流為零。</P> <H2 style="TEXT-INDENT: 2em"><STRONG>正偏</STRONG></H2> <P style="TEXT-INDENT: 2em">加正向電壓（正偏）——電源正極接P區(qū)，負(fù)極接N區(qū)，外電場的方向與內(nèi)電場方向相反。</P> <P style="TEXT-INDENT: 2em">外電場削弱內(nèi)電場→耗盡層變窄→擴(kuò)散運(yùn)動→漂移運(yùn)動→多子擴(kuò)散形成正向電流（與外電場方向一致）IF，而且外加正向電壓對正向電流有很強(qiáng)的控制作用。</P> <H2 style="TEXT-INDENT: 2em"><STRONG>反偏</STRONG></H2> <P style="TEXT-INDENT: 2em">加反向電壓（反偏）——電源正極接N區(qū)，負(fù)極接P區(qū)，外電場的方向與內(nèi)電場方向相同。</P> <P style="TEXT-INDENT: 2em">外電場加強(qiáng)內(nèi)電場→耗盡層變寬→漂移運(yùn)動→擴(kuò)散運(yùn)動→少子漂移形成反向電流IR，而且反向電流基本上不隨外加電壓而變化，但隨溫度變化大。</P> <P style="TEXT-INDENT: 2em">pn結(jié)的單向?qū)щ娦杂惺裁醋饔茫?/P> <P style="TEXT-INDENT: 2em">空間電荷區(qū)也稱 PN 結(jié)</P> <P><A href="/jichu/UploadFiles_6678/202007/2020071817061161.gif" target=_blank><IMG onmousewheel="return bbimg(this)" border=0 alt="空間電荷區(qū)也稱 PN 結(jié)" src="/jichu/UploadFiles_6678/202007/2020071817061161.gif" width=540 onload=resizepic(this) height=312> </A></P> <P style="TEXT-INDENT: 2em"><STRONG>1.PN 結(jié)加正向電壓（正向偏置）</STRONG></P> <P style="TEXT-INDENT: 2em">內(nèi)電場被削弱，多子的擴(kuò)散加強(qiáng)，形成較大的擴(kuò)散電流。</P> <P><A href="/jichu/UploadFiles_6678/202007/2020071817074207.gif" target=_blank><IMG onmousewheel="return bbimg(this)" border=0 alt=PN結(jié)加正向電壓，PN結(jié)內(nèi)電場 src="/jichu/UploadFiles_6678/202007/2020071817074207.gif" width=563 onload=resizepic(this) height=290> </A></P> <P style="TEXT-INDENT: 2em">PN 結(jié)加正向電壓時，PN結(jié)變窄，正向電流較大，正向電阻較小，PN結(jié)處于導(dǎo)通狀態(tài)。</P> <P style="TEXT-INDENT: 2em"><STRONG>2.PN 結(jié)加反向電壓（反向偏置）</STRONG></P> <P><A href="/jichu/UploadFiles_6678/202007/2020071817091945.gif" target=_blank><IMG onmousewheel="return bbimg(this)" border=0 alt=PN結(jié)加反向電壓（反向偏置） src="/jichu/UploadFiles_6678/202007/2020071817091945.gif" width=461 onload=resizepic(this) height=253> </A></P> <P style="TEXT-INDENT: 2em">內(nèi)電場被加強(qiáng)，少子的漂移加強(qiáng)，由于少子數(shù)量很少，形成很小的反向電流。</P> <P style="TEXT-INDENT: 2em">PN 結(jié)加反向電壓時，PN結(jié)變寬，反向電流較小，反向電阻較大，PN結(jié)處于截止?fàn)顟B(tài)。</P> <P style="TEXT-INDENT: 2em">溫度越高少子的數(shù)目越多，反向電流將隨溫度增加。</P> <script language='javascript' src='/myxin/200806/pageb.js'></script> </div> <div id="nzwtbrw" class=pagebreak></div> <div id="rjnrveu" class=text_tag> <h5>Tags：<b>PN結(jié),單向?qū)щ娦?/b> </h5><span>責(zé)任編輯：admin</span> </div> <div id="dkwpxch" class=xg> <li>上一個文章： <a class='LinkPrevArticle' href='/jichu/semiconductor/6398.html' title='文章標(biāo)題：PN結(jié)的電容效應(yīng)——擴(kuò)散電容作者：佚名更新時間：2020/7/18 16:58:02'>PN結(jié)的電容效應(yīng)——擴(kuò)散電容</a></li><li>下一個文章： <a class='LinkNextArticle' href='/jichu/semiconductor/6586.html' title='文章標(biāo)題：半導(dǎo)體制冷片的工作原理是什么作者：佚名更新時間：2021/4/17 17:03:17'>半導(dǎo)體制冷片的工作原理是什么</a></li> </div> <div id="qjrdhmn" class=box_xg> <div id="whtiugl" class=title_xg>相關(guān)文章列表</div> <a class='LinkArticleCorrelative' href='/jichu/semiconductor/8599.html' title='文章標(biāo)題：半導(dǎo)體pn結(jié)的形成/多晶硅中PN結(jié)是怎樣形成的？空穴和自由電子作者：佚名更新時間：2023/5/6 17:39:46' target="_self">半導(dǎo)體pn結(jié)的形成/多晶硅中PN結(jié)是怎樣形成的？空穴和自由電子</a><br><a class='LinkArticleCorrelative' href='/jichu/semiconductor/6704.html' 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