Hom ntawmphotodetector ntaus ntawvlub tsev
Photodetectoryog lub cuab yeej siv uas converts optical teeb liab rau hauv hluav taws xob teeb liab, nws cov qauv thiab ntau yam, tuaj yeem muab faib ua cov hauv qab no:
(1) Photoconductive photodetector
Thaum cov khoom siv photoconductive tau raug rau lub teeb, cov photogenerated Carrier nce lawv cov kev coj ua thiab tsawg dua. Cov tsheb thauj khoom zoo siab nyob rau hauv chav kub txav mus rau hauv ib qho kev coj ua nyob rau hauv kev txiav txim nyob rau hauv qhov kev txiav txim ntawm ib daim teb hluav taws xob, yog li tsim tawm tam sim no. Nyob rau hauv cov xwm txheej ntawm lub teeb, hluav taws xob zoo siab thiab hloov tshwm sim. Nyob rau tib lub sijhawm, lawv drift nyob rau hauv qhov kev txiav txim ntawm ib daim teb hluav taws xob los ua ib lub photocurrent. Lub resulting photievenerated cov neeg muaj peev xwm nce kev ua haujlwm ntawm cov cuab yeej thiab li no txo cov tsis kam. Photoconductive photoodetectors feem ntau ua kom muaj peev xwm nce siab thiab ua tau zoo rau kev siv kho tshiab ntawm photoconductive ntawm cov cuab yeej ntawm photoconductive hauv qee qhov.
(2)Pn photodetector
Pn photodetector yog tsim los ntawm kev sib cuag ntawm P-Hom Semiconductor cov khoom siv thiab N-hom cov khoom siv soobualuctor. Ua ntej kev tiv tauj yog tsim, ob cov ntaub ntawv nyob hauv ib lub xeev cais. Theem Fermi hauv P-Hom Syniconductor yog ze rau ntawm ntug kev Valence, thaum lub Fermi theem nyob rau hauv n-hom syniconductor yog ze rau ntawm ntug kev conduction ntawm lub conduction. Nyob rau tib lub sijhawm, cov lus Fermi ntawm N-hom khoom ntawm lub ntug conductionly hloov mus kom txog thaum lub fermi ntawm ob cov ntaub ntawv nyob hauv tib txoj haujlwm. Kev hloov pauv ntawm txoj hauj lwm ntawm kev conduction band thiab valence band kuj tseem nrog tus khoov ntawm pab pawg. Lub PN kev sib tshuam yog nyob rau hauv qhov sib npaug thiab muaj ib qib fermi zoo nkauj. Txij li qhov kev txiav txim ntawm kev them nqi tshawb xyuas, feem ntau ntawm cov neeg nqa khoom hauv P-hom khoom siv yog qhov, thaum feem ntau ntawm cov khoom siv hauv n-hom ntawv siv hluav taws xob. Thaum ob cov khoom siv tau sib chwv, vim muaj qhov sib tiv tauj hauv cov khoom lag luam cov khoom siv tsis sib xws, thaum cov tshuab hluav taws xob sib txawv cov khoom siv yuav diffuse nyob rau hauv kev coj rov qab rau lub qhov. Cov chaw nruab nrab sab laug los ntawm kev sib txawv ntawm cov electrusion thiab qhov yuav ua rau hluav taws xob kev txav, thiab cov kev taw qhia ntawm kev sib txawv ntawm kev sib txawv ntawm kev sib txawv, uas txhais tau tias tus tsim ntawm lub built-intric teb tiv thaiv cov diffusion ntawm cov nqa khoom, thiab muaj ob qho kev sib txawv kom txog thaum ob hom lus tsa suab kom paub tseeb, yog li ntawd lub cab kuj zoo li cas yog xoom. Sab hauv dynamic tshuav nyiaj.
Thaum lub sij hawm NTaug yog nthuav tawm rau lub teeb hluav taws xob, lub zog ntawm lub photon pauv mus rau cov cab kuj, thiab cov photogenerated electron-qhov ua khub, yog tsim. Nyob rau hauv qhov kev txiav txim ntawm lub teb hluav taws xob, lub qhov hluav taws xob thiab qhov chaw txav mus rau hauv ib cheeb tsam N cheeb tsam thiab PE Direction Drift ntawm Photogenated Carreator ua rau cov ntaub ntawv xov tooj cua. Qhov no yog lub ntsiab cai tseem ceeb ntawm PN hlws rau photodetector.
(3)Tus Photodetector
Tus pin photodiode yog p-hom khoom siv thiab n-hom khoom siv nyob nruab nrab ntawm kuv txheej, Kuv txheej txheej txheej ntawm cov khoom siv yog feem ntau ntawm cov khoom siv tsis zoo lossis cov khoom siv tsis zoo. Nws cov tshuab ua haujlwm zoo ib yam li lub tshav puam pawb, lub photon hloov hluav taws xob, thiab cov hluav taws xob sab hauv lossis hluav taws xob sab nraud yuav cais cov ntawv xov hluav taws xob-qhov Cov khub nyob rau hauv cov txheej depletion, thiab cov neeg nqa khoom thauj khoom uas tau ua rau muaj qhov tam sim no nyob hauv Circuit Court. Lub luag haujlwm ua si los ntawm txheej Kuv yog kom nthuav dav ntawm txheej depletion, thiab txheej uas kuv yuav tau sib cais sai heev, yog li cov lus teb ceev ntawm lub Phaj Pauv Feem ntau yog ib feem ntau sai dua li ntawm PN sib tshuam ntes. Cov neeg nqa khoom sab nraud ntawm kuv txheej los kuj tau sau los ntawm cov txheej txheem depletion los ntawm kev sib txawv txav, sib diffusion tam sim no. Lub thickness ntawm kuv txheej feem ntau yooj yim nyias, thiab nws lub hom phiaj yog txhawm rau txhim kho cov lus teb ceev ntawm lub ntsuas.
(4)Ad PhotodetectorAvalanche photodiode
Lub tshuab ntawmAvalanche photodiodeyog zoo li ntawm pn hlws ris. Ad photoDetector siv cov doped hnyav tshaj plaws pn trunws, thiab thaum muaj kev sib tw ntawm APD, thiab kev ua haujlwm ntawm lub ntsuas hluav taws xob tau nce photocurrent. Thaum APD nyob hauv hom bias thim rov qab, hluav taws xob teb hauv txheej txheej txheem depetion yuav muaj zog heev, thiab txav mus los sai sai hauv hluav taws xob. Muaj qhov tshwm sim uas cov hluav taws xob hluav taws xob yuav tsoo mus rau hauv qhov chaw nyob rau hauv lub neej thaum lub sijhawm no, ua rau cov tshuab hluav taws xob ua kom muaj kev tawm tsam. Tus txheej txheem no tau rov ua dua, thiab cov ionized ions hauv lub lattice kuj tseem sib tsoo, ua rau cov neeg nqa khoom nyob hauv apd kom nce, ua rau muaj qhov loj. Nws yog qhov no txhais tau lub cev mechanism hauv APD uas detectors feem ntau muaj cov yam ntxwv ntawm cov lus teb ceev, tus nqi tam sim no nce thiab siab rhiab. Piv nrog pn hlws ris thiab tus pin kev sib tshuam, Apd muaj cov lus teb nrawm nrawm, uas yog qhov kev teb sai tshaj plaws ntawm cov duab tam sim no.
(5) Schattky kev sib tw photodetector
Cov qauv theem pib ntawm Schottky kev sib tw photoDetector yog cov yam ntxwv ntawm PN piav qhia saum toj no, thiab nws muaj unidirectional conductivity nrog qhov kev txiav zoo thiab rov qab txiav. Thaum hlau nrog txoj haujlwm ua haujlwm siab thiab lub semiconductor nrog Daim Ntawv Ua Haujlwm Tsawg Ua Haujlwm, thiab kev sib tshuam ua tiav, thiab kev sib tshuam yog kev sib tshuam scottky. Lub ntsiab mechanism yog me ntsis zoo ib yam li cov kab sib tw, noj n-hom semiconductors raws li ib qho kev sib cuag sib txawv, thaum muaj ob lub tshuab hluav taws xob sib chemiconduct yuav diffuse mus rau sab hlau. Cov tshuab hluav taws xob sib txawv tau sib txuas ntxiv ntawm ib qho kawg ntawm cov hlau uas muaj hluav taws xob tsis zoo rau cov hlau, thiab cov hluav taws xob yuav ntws mus hauv qab Sab hauv hluav taws xob teb, thiab cov cab kuj yuav raug coj los ua ke, tom qab lub sijhawm kom ncav cuag cov kev sib npaug zoo nkauj, thiab thaum kawg tsim Scottky, thiab thaum kawg tsim Scottky kev sib tshuam. Nyob rau hauv lub teeb tej yam kev mob, thaj av barier ncaj qha lub teeb thiab ua khub electronn, thaum lub sij hawm pack kev yuav tsum tau dhau los ntawm thaj chaw sib tshuam mus txog thaj av. Piv nrog pn hlws ris, lub photodetector raws li schottky kev sib tshuam muaj kev teb sai sai, thiab cov lus teb yuav txawm mus txog NS theem.
Lub sij hawm Post: Lub Yim-13-2024