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class="content"> PN結(jié)單向?qū)щ娫斫馕雠cPN結(jié)為什么可以單向?qū)щ?br /> <div>PN結(jié)是什么？</div> <div>PN結(jié)采用不同的摻雜工藝，通過(guò)擴(kuò)散作用，將P型半導(dǎo)體與N型半導(dǎo)體制作在同一塊半導(dǎo)體（通常是硅或鍺）基片上，在它們的交界面就形成空間電荷區(qū)稱為PN結(jié)（英語(yǔ)：PN junction）。PN結(jié)具有單向?qū)щ娦?，是電子技術(shù)中許多器件所利用的特性，例如半導(dǎo)體二極管、雙極性晶體管的物質(zhì)基礎(chǔ)。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042721189.jpg" style="width: 464px; height: 472px;" /></div> <div>二極管為什么只能單向?qū)щ姡?/div> <div>在二極管的正向端（正極）加正電壓，負(fù)向端（負(fù)極）加負(fù)電壓，二極管導(dǎo)通，有電流流過(guò)二極管。在二極管的正向端（正極）加負(fù)電壓，負(fù)向端（負(fù)極）加正電壓，二極管截止，沒(méi)有電流流過(guò)二極管。這就是所說(shuō)的二極管的單向?qū)ㄌ匦浴Ｏ旅娼忉尀槭裁炊O管會(huì)單向?qū)ā?/div> <div>二極管是由PN結(jié)組成的，即P型半導(dǎo)體和N型半導(dǎo)體，因此PN結(jié)的特性導(dǎo)致了二極管的單向?qū)щ娞匦?。PN結(jié)如下圖所示：</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042735711.jpg" style="width: 530px; height: 432px;" /></div> <div>在P型和N型半導(dǎo)體的交界面附近，由于N區(qū)的自由電子濃度大，于是帶負(fù)電荷的自由電子會(huì)由N區(qū)向電子濃度低的P區(qū)擴(kuò)散，擴(kuò)散的結(jié)果使PN結(jié)中靠P區(qū)一側(cè)帶負(fù)電，靠N區(qū)一側(cè)帶正電，形成由N區(qū)指向P區(qū)的電場(chǎng)。diangon.com即PN結(jié)內(nèi)電場(chǎng)。內(nèi)電場(chǎng)將阻礙多數(shù)載流子的繼續(xù)擴(kuò)散，又稱為阻檔層。</div> <div>PN結(jié)為什么可以單向?qū)щ姡?/div> <div>二極管的單向?qū)щ娞匦杂猛竞軓V，到底是什么原因讓電子如此聽(tīng)話呢？它的微觀機(jī)理是什么呢？這里簡(jiǎn)單形象介紹一下：</div> <div>假設(shè)有一塊P型半導(dǎo)體（用黃色代表空穴多）和一塊N型半導(dǎo)體（用綠色代表電子多），它們自然狀態(tài)下分別都是電中性的，即不帶電。如圖1所示。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042748459.jpg" style="width: 455px; height: 301px;" /></div> <div>把它們結(jié)合在一起，就形成PN結(jié)。邊界處N型半導(dǎo)體的電子自然就會(huì)跑去P型區(qū)填補(bǔ)空穴，留下失去電子而顯正電的原子。相應(yīng)P型區(qū)邊界的原子由于得到電子而顯負(fù)電，于是就在邊界形成一個(gè)空間電荷區(qū)。為什么叫“空間電荷區(qū)”？是因?yàn)檫@些電荷是微觀空間內(nèi)無(wú)法移動(dòng)的原子構(gòu)成的。</div> <div>空間電荷區(qū)形成一個(gè)內(nèi)建電場(chǎng)，電場(chǎng)方向由N到P，這個(gè)電場(chǎng)阻止了后面的電子繼續(xù)過(guò)來(lái)填補(bǔ)空穴，因?yàn)檫@時(shí)P型區(qū)的負(fù)空間電荷是排斥電子的。電子和空穴的結(jié)合會(huì)越來(lái)越慢，最后達(dá)到平衡，相當(dāng)于載流子耗盡了，所以空間電荷區(qū)也叫耗盡層。這時(shí)PN結(jié)整體還呈電中性，因?yàn)榭臻g電荷有正有負(fù)互相抵消。如圖2所示。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042801863.jpg" style="width: 457px; height: 305px;" /></div> <div>外加正向電壓，電場(chǎng)方向由正到負(fù)，與內(nèi)建電場(chǎng)相反，削弱了內(nèi)建電場(chǎng)，所以二極管容易導(dǎo)通。綠色箭頭表示電子流動(dòng)方向，與電流定義的方向相反。如圖3所示。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042816822.jpg" style="width: 440px; height: 302px;" /></div> <div>外加反向電壓，電場(chǎng)方向與內(nèi)建電場(chǎng)相同，增強(qiáng)了內(nèi)建電場(chǎng)，所以二極管不容易導(dǎo)通。如圖4所示。當(dāng)然，不導(dǎo)通也不是絕對(duì)的，一般會(huì)有很小的漏電流。隨著反向電壓如果繼續(xù)增大，可能造成二極管擊穿而急劇漏電。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042836526.jpg" style="width: 488px; height: 316px;" /></div> <div>圖5是二極管的電流電壓曲線供參考。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042851734.jpg" style="width: 488px; height: 302px;" /></div> <div>圖6形象的展示了不同方向二極管為什么能導(dǎo)通和不能導(dǎo)通，方便理解。</div> <div><img alt="PN結(jié),二極管" src="http://m.chinese-av.com/uploadfile/2020/0831/20200831042907880.jpg" style="width: 530px; height: 455px;" /></div> <div>生活中單向?qū)ǖ睦右膊簧?，比如地鐵進(jìn)站口的單向閘機(jī)，也相當(dāng)于二極管的效果：正向?qū)?，反向不?dǎo)通，如果硬要反向通過(guò)，可能就會(huì)因?yàn)樘罅?ldquo;反向擊穿”破壞閘機(jī)了。<br /> 烜芯微專業(yè)制造二極管，三極管，MOS管，橋堆等20年，工廠直銷省20%，4000家電路電器生產(chǎn)企業(yè)選用，專業(yè)的工程師幫您穩(wěn)定好每一批產(chǎn)品，如果您有遇到什么需要幫助解決的,可以點(diǎn)擊右邊的工程師,或者點(diǎn)擊銷售經(jīng)理給您精準(zhǔn)的報(bào)價(jià)以及產(chǎn)品介紹</div> </div> <ul class="fy"> <li>上一篇：<a href="http://m.chinese-av.com/2020/changjianwtjd_0831/2076.html">MOSFET電路類型集合和特性分析-MOSFET開(kāi)關(guān)電路</a></li> <li>下一篇：<a 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