Tus PIN photodetector yog dab tsi?

Dab tsi yog ib qhoTus ntsuas duab PIN

Lub photodetector yog ib qho cuab yeej rhiab heevcov khoom siv semiconductor photonicuas hloov lub teeb mus ua hluav taws xob los ntawm kev siv cov nyhuv photoelectric. Nws lub ntsiab tivthaiv yog lub photodiode (PD photodetector). Hom feem ntau yog tsim los ntawm PN junction, cov electrode leads sib xws thiab lub plhaub raj. Nws muaj kev coj ua unidirectional. Thaum lub zog pem hauv ntej raug siv, lub diode ua haujlwm; thaum lub zog rov qab raug siv, lub diode txiav tawm. PD photodetector zoo ib yam li lub semiconductor diode, tsuas yog tiasPD photodetectorua haujlwm nyob rau hauv qab voltage rov qab thiab tuaj yeem raug nthuav tawm. Nws tau ntim los ntawm lub qhov rais lossis kev sib txuas fiber ntau, tso cai rau lub teeb mus txog qhov photosensitive ntawm lub cuab yeej.

Lub caij no, feem ntau siv cov khoom hauv PD photodetector tsis yog PN junction tab sis PIN junction. Piv nrog rau PN junction, PIN junction muaj ib txheej I ntxiv rau hauv nruab nrab. Txheej I yog ib txheej ntawm N-hom semiconductor nrog qhov concentration doping qis heev. Vim tias nws yog ib qho semiconductor Intrinsic nrog qhov concentration qis, nws hu ua txheej I. Txheej I yog tuab thiab yuav luag nyob hauv tag nrho thaj chaw depletion. Feem ntau ntawm cov photons tshwm sim raug nqus rau hauv txheej I thiab tsim cov khub electron-hole (photogenerated carriers). Ntawm ob sab ntawm txheej I yog P-hom thiab N-hom semiconductors nrog cov concentration doping siab heev. Cov txheej P thiab N yog nyias heev, nqus ib feem me me ntawm cov photons tshwm sim thiab tsim cov lej me me ntawm cov photogenerated carriers. Cov qauv no tuaj yeem ua kom nrawm dua qhov teb ntawm cov nyhuv photoelectric. Txawm li cas los xij, thaj chaw depletion dav dhau yuav ua rau lub sijhawm drift ntawm cov photogenerated carriers hauv thaj chaw depletion ntev dua, uas hloov chaw ua rau muaj kev teb qeeb dua. Yog li ntawd, qhov dav ntawm thaj chaw depletion yuav tsum tau xaiv kom tsim nyog. Qhov ceev teb ntawm PIN junction diode tuaj yeem hloov pauv los ntawm kev tswj qhov dav ntawm thaj chaw depletion.

Tus PIN photodetector yog lub cuab yeej ntes hluav taws xob siab uas muaj kev daws teeb meem zoo heev thiab kev ua haujlwm zoo. Nws tuaj yeem ntsuas ntau hom hluav taws xob kom raug thiab ua tiav kev teb sai thiab kev ruaj khov siab. Lub luag haujlwm ntawmlub tshuab ntes duabyog hloov ob lub teeb liab tom qab lub zaus ntaus mus rau hauv cov teeb liab hluav taws xob, tshem tawm qhov suab nrov ntxiv ntawm lub teeb oscillator hauv zos, txhim kho lub teeb liab zaus nruab nrab, thiab txhim kho qhov sib piv ntawm lub teeb liab rau lub suab nrov. PIN photodetectors muaj cov qauv yooj yim, yooj yim siv, muaj kev nkag siab siab, nce siab, bandwidth siab, suab nrov qis, thiab muaj peev xwm tiv thaiv kev cuam tshuam zoo. Lawv tuaj yeem ua haujlwm ruaj khov hauv ntau qhov chaw nyuaj thiab feem ntau yog siv rau kev ntsuas cua lidar teeb liab nrhiav.