Tus PIN photodetector yog dab tsi

Dab tsi yog aPIN photodetector

Lub photodetector yog precisely ib tug heev rhiab heevsemiconductor photonic ntaus ntawvuas hloov lub teeb rau hauv hluav taws xob los ntawm kev siv cov nyhuv photoelectric. Nws cov khoom tseem ceeb yog photodiode (PD photodetector). Feem ntau hom yog tsim los ntawm PN hlws ris, coj cov electrode coj thiab lub plhaub raj. Nws muaj unidirectional conductivity. Thaum siv rau pem hauv ntej voltage, lub diode conducts; Thaum ib tug rov qab voltage yog thov, lub diode txiav tawm. PD photodetector zoo ib yam li ib qho semiconductor diode, tsuas yog qhov ntawdPD photodetector muajua haujlwm nyob rau hauv qhov rov qab voltage thiab tuaj yeem raug. Nws yog ntim los ntawm lub qhov rais los yog optical fiber kev twb kev txuas, tso cai rau lub teeb mus txog lub photosensitive ib feem ntawm lub cuab yeej.

Lub caij no, cov khoom siv feem ntau siv hauv PD photodetector tsis yog PN kev sib tshuam tab sis tus PIN junction. Piv nrog rau PN kev sib tshuam, tus PIN hlws ris muaj ib txheej I ntxiv rau hauv nruab nrab. I txheej yog txheej N-hom semiconductor nrog cov doping concentration tsawg heev. Vim tias nws yog ib qho yuav luag Intrinsic semiconductor nrog qis concentration, nws hu ua I txheej. Txheej kuv yog tuab heev thiab yuav luag occupies tag nrho cov depletion cheeb tsam. Feem ntau ntawm cov xwm txheej photons yog absorbed nyob rau hauv I txheej thiab tsim electron-qhov khub (photogenerated carriers). Ntawm ob sab ntawm I txheej yog P-hom thiab N-hom semiconductors nrog siab doping concentrations. P thiab N txheej yog nyias nyias, absorbing ib feem me me ntawm cov teeb meem photons thiab tsim ib tug me me ntawm photogenerated carriers. Cov qauv no tuaj yeem ua kom nrawm nrawm nrawm ntawm cov nyhuv photoelectric. Txawm li cas los xij, thaj av depletion ntau dhau yuav ncua lub sijhawm drift ntawm cov neeg nqa khoom photogenerated hauv cheeb tsam depletion, uas ua rau cov lus teb qeeb dua. Yog li ntawd, qhov dav ntawm cheeb tsam depletion yuav tsum raug xaiv kom tsim nyog. Cov lus teb ceev ntawm tus PIN junction diode tuaj yeem hloov tau los ntawm kev tswj qhov dav ntawm thaj tsam depletion.

Tus PIN photodetector yog lub ntsuas hluav taws xob siab tshaj plaws nrog lub zog daws teeb meem zoo thiab nrhiav kom pom kev ua haujlwm zoo. Nws tuaj yeem ntsuas tau ntau hom hluav taws xob hluav taws xob thiab ua tiav cov lus teb sai thiab kev ua haujlwm siab ruaj khov. Kev ua haujlwm ntawm lubphotodetectoryog los hloov ob lub teeb yoj teeb liab tom qab lub suab nrov zaus rau hauv cov teeb liab hluav taws xob, tshem tawm cov suab nrov ntxiv ntawm lub teeb oscillator hauv zos, txhim kho cov teeb liab nruab nrab zaus, thiab txhim kho cov teeb liab-rau-suab nrov piv. PIN photodetectors muaj cov qauv yooj yim, yooj yim ntawm kev siv, siab rhiab heev, nce siab, siab bandwidth, suab nrov tsawg, thiab muaj peev xwm tiv thaiv kev cuam tshuam. Lawv tuaj yeem ua haujlwm ruaj khov hauv ntau qhov chaw hnyav thiab feem ntau yog siv rau hauv kev ntsuas cua ntsuas lidar teeb liab.