Kev tshawb fawb tshiab ntawm avalanche photodetector

Kev tshawb fawb tshiab ntawmLub avalanche photodetector

Infrared detection technology yog dav siv nyob rau hauv tub rog nrhiav, kev saib xyuas ib puag ncig, kev kuaj mob thiab lwm yam kev lag luam. Traditional infrared detectors muaj qee qhov kev txwv hauv kev ua haujlwm, xws li kev tshawb nrhiav rhiab heev, teb ceev thiab lwm yam. InAs/InAsSb Class II superlattice (T2SL) cov ntaub ntawv muaj cov khoom siv hluav taws xob zoo tshaj plaws thiab kev ua haujlwm zoo, ua rau lawv zoo tagnrho rau cov ntsuas hluav taws xob ntev ntev (LWIR). Qhov teeb meem ntawm cov lus teb tsis muaj zog nyob rau hauv ntev nthwv dej infrared nrhiav tau ib qho kev txhawj xeeb rau lub sijhawm ntev, uas txwv tsis pub muaj kev ntseeg siab ntawm cov khoom siv hluav taws xob. Txawm hais tias avalanche photodetector (APD photodetector) muaj cov lus teb zoo heev, nws raug kev txom nyem los ntawm qhov tsaus nti tam sim no thaum sib npaug.

Txhawm rau daws cov teeb meem no, ib pab pawg los ntawm University of Electronic Science thiab Technology ntawm Tuam Tshoj tau ua tiav kev ua haujlwm siab Class II superlattice (T2SL) ntev-yoj infrared avalanche photodiode (APD). Cov kws tshawb fawb tau siv qhov qis dua auger recombination tus nqi ntawm InAs / InAsSb T2SL absorber txheej los txo qhov tsaus ntuj tam sim no. Nyob rau tib lub sijhawm, AlAsSb nrog tus nqi qis k yog siv los ua cov txheej txheem sib npaug los txo cov suab nrov thaum tswj kom txaus nce. Qhov kev tsim qauv no muab cov lus cog tseg rau kev txhawb nqa kev txhim kho ntawm cov nthwv dej ntev infrared tshawb pom tshuab. Lub tshuab ntes tau txais kev tsim qauv tsim, thiab los ntawm kev kho qhov sib piv ntawm InAs thiab InAsSb, qhov kev hloov pauv ntawm cov qauv band tiav, thiab kev ua haujlwm ntawm lub tshuab ntes tau zoo tuaj. Hais txog kev xaiv cov khoom siv thiab cov txheej txheem npaj, txoj kev tshawb fawb no piav qhia meej txog txoj kev loj hlob thiab cov txheej txheem ntawm InAs/InAsSb T2SL cov khoom siv los npaj cov khoom siv. Kev txiav txim siab muaj pes tsawg leeg thiab tuab ntawm InAs / InAsSb T2SL yog qhov tseem ceeb thiab kev hloov pauv yuav tsum tau ua kom ua tiav qhov kev ntxhov siab. Nyob rau hauv cov ntsiab lus ntawm kev tshawb nrhiav ntev-yoj infrared, kom ua tiav tib qhov kev txiav tawm wavelength xws li InAs/GaSb T2SL, yuav tsum muaj qhov tuab InAs/InAsSb T2SL ib lub sijhawm. Txawm li cas los xij, cov monocycle thicker ua rau txo qis hauv kev nqus coefficient hauv kev coj ntawm kev loj hlob thiab nce hauv qhov ua tau zoo ntawm qhov hauv T2SL. Nws tau pom tias ntxiv Sb tivthaiv tuaj yeem ua tiav qhov kev txiav tawm ntev dua yam tsis muaj kev nce ntxiv ib lub sijhawm tuab. Txawm li cas los xij, kev sib xyaw Sb ntau dhau tuaj yeem ua rau muaj kev sib cais ntawm Sb ntsiab lus.

Yog li ntawd, InAs/InAs0.5Sb0.5 T2SL nrog Sb pawg 0.5 raug xaiv los ua cov txheej txheem ntawm APDphotodetector. InAs/InAsSb T2SL feem ntau loj hlob ntawm GaSb substrates, yog li lub luag haujlwm ntawm GaSb hauv kev tswj hwm yuav tsum tau txiav txim siab. Qhov tseem ceeb, kev ua tiav qhov sib npaug sib npaug yuav suav nrog kev sib piv qhov nruab nrab lattice tas li ntawm superlattice rau ib lub sij hawm mus rau lattice tas li ntawm lub substrate. Feem ntau, lub tensile strain nyob rau hauv InAs yog compensated los ntawm compressive strain qhia los ntawm InAsSb, uas ua rau ib tug thicker InAs txheej tshaj lub InAsSb txheej. Txoj kev tshawb no ntsuas cov duab hluav taws xob teb cov yam ntxwv ntawm lub avalanche photodetector, suav nrog cov lus teb spectral, tsaus nti tam sim no, suab nrov, thiab lwm yam. Lub avalanche multiplication effect ntawm avalanche photodetector yog soj ntsuam, thiab kev sib raug zoo ntawm qhov sib npaug thiab qhov xwm txheej lub teeb lub zog, qhov kub thiab txias thiab lwm yam tsis tau tham.

FIG. (A) Schematic daim duab ntawm InAs/InAsSb ntev-yoj infrared APD photodetector; (B) Daim duab kos duab hluav taws xob ntawm txhua txheej ntawm APD photodetector.