Bipolar ob-dimensional avalanche photodetector

Bipolar ob sablub tshuab ntes duab av qeeg

Lub bipolar ob-dimensional avalanche photodetector (APD photodetector) ua tiav qhov suab nrov qis heev thiab kev kuaj pom kev rhiab heev

Kev tshawb pom qhov rhiab heev ntawm ob peb lub photons lossis txawm tias ib lub photons muaj qhov xav tau tseem ceeb hauv cov teb xws li kev thaij duab lub teeb tsis muaj zog, kev tshawb nrhiav deb thiab telemetry, thiab kev sib txuas lus quantum. Ntawm lawv, lub avalanche photodetector (APD) tau dhau los ua ib qho kev taw qhia tseem ceeb hauv kev tshawb fawb txog cov khoom siv optoelectronic vim nws cov yam ntxwv ntawm qhov me me, kev ua haujlwm siab thiab kev sib koom ua ke yooj yim. Qhov sib piv ntawm lub teeb liab rau lub suab nrov (SNR) yog qhov qhia tseem ceeb ntawm APD photodetector, uas xav tau qhov nce siab thiab qhov tsaus ntuj qis. Kev tshawb fawb ntawm van der Waals heterojunctions ntawm ob-seem (2D) cov ntaub ntawv qhia txog kev cia siab dav hauv kev txhim kho cov APD ua tau zoo. Cov kws tshawb fawb los ntawm Tuam Tshoj tau xaiv cov khoom siv semiconductor bipolar ob-seem WSe₂ ua cov khoom siv photosensitive thiab npaj APD photodetector nrog Pt / WSe₂ / Ni qauv uas muaj qhov ua haujlwm zoo tshaj plaws, txhawm rau daws qhov teeb meem suab nrov ntawm APD photodetector ib txwm muaj.

Cov pab pawg tshawb fawb tau tawm tswv yim txog lub tshuab ntsuas hluav taws xob avalanche raws li Pt/WSe₂/Ni qauv, uas ua tiav qhov kev ntes tau cov teeb liab tsis muaj zog heev ntawm qib fW ntawm chav tsev kub. Lawv tau xaiv cov khoom siv semiconductor ob-seem WSe₂, uas muaj cov khoom siv hluav taws xob zoo heev, thiab ua ke cov khoom siv hluav taws xob Pt thiab Ni los tsim ib hom tshiab ntawm lub tshuab ntsuas hluav taws xob avalanche. Los ntawm kev ua kom zoo tshaj plaws ntawm kev ua haujlwm sib phim ntawm Pt, WSe₂ thiab Ni, lub tshuab thauj khoom tau tsim los uas tuaj yeem thaiv cov neeg nqa khoom tsaus ntuj thaum xaiv tso cai rau cov neeg nqa khoom photogenerated hla dhau. Lub tshuab no txo ​​​​​​cov suab nrov ntau dhau los ntawm kev cuam tshuam ntawm cov neeg nqa khoom ionization, ua rau lub tshuab ntsuas hluav taws xob ua tiav qhov kev ntes tau cov teeb liab optical rhiab heev ntawm qib suab nrov qis heev.

Tom qab ntawd, txhawm rau kom paub meej txog lub tshuab tom qab qhov cuam tshuam ntawm av qeeg uas tshwm sim los ntawm lub zog hluav taws xob tsis muaj zog, cov kws tshawb fawb tau soj ntsuam qhov sib xws ntawm cov haujlwm ua haujlwm ntawm ntau yam hlau nrog WSe₂. Ib qho ntawm cov khoom siv hlau-semiconductor-hlau (MSM) nrog cov hlau electrodes sib txawv tau tsim thiab kev sim cuam tshuam tau ua rau lawv. Tsis tas li ntawd, los ntawm kev txo cov neeg nqa khoom tawg ua ntej av qeeg pib, qhov randomness ntawm kev cuam tshuam ionization tuaj yeem txo qis, yog li txo cov suab nrov. Yog li ntawd, kev sim cuam tshuam tau ua. Txhawm rau kom pom tseeb ntxiv txog qhov zoo tshaj plaws ntawm Pt / WSe₂ / Ni APD hauv cov yam ntxwv teb lub sijhawm, cov kws tshawb fawb tau soj ntsuam ntxiv -3 dB bandwidth ntawm lub cuab yeej hauv qab cov nqi photoelectric nce sib txawv.

Cov txiaj ntsig ntawm kev sim qhia tau hais tias lub tshuab ntes Pt/WSe₂/Ni muaj lub zog sib npaug suab qis heev (NEP) ntawm qhov kub thiab txias, uas tsuas yog 8.07 fW/√Hz xwb. Qhov no txhais tau hais tias lub tshuab ntes tuaj yeem txheeb xyuas cov teeb liab tsis muaj zog heev. Tsis tas li ntawd, lub cuab yeej no tuaj yeem ua haujlwm ruaj khov ntawm qhov zaus hloov kho ntawm 20 kHz nrog qhov nce siab ntawm 5 × 10⁵, daws tau qhov teeb meem ntawm cov khoom siv photovoltaic ib txwm muaj uas nyuaj rau sib npaug qhov nce siab thiab bandwidth. Qhov no yuav tsum muab nws cov txiaj ntsig zoo hauv cov ntawv thov uas xav tau qhov nce siab thiab suab qis.

Cov kev tshawb fawb no qhia txog lub luag haujlwm tseem ceeb ntawm kev tsim khoom siv thiab kev ua kom zoo dua ntawm qhov interface hauv kev txhim kho kev ua tau zoo ntawmphotodetectorsLos ntawm kev tsim cov electrodes thiab cov ntaub ntawv ob-seem zoo kawg nkaus, qhov cuam tshuam ntawm cov neeg nqa khoom tsaus ntuj tau ua tiav, txo qhov cuam tshuam suab nrov thiab txhim kho kev ua haujlwm ntawm kev tshawb pom.

Qhov kev ua tau zoo ntawm lub tshuab ntes no tsis yog tsuas yog pom tseeb hauv cov yam ntxwv photoelectric xwb, tab sis kuj muaj kev cia siab dav dav. Nrog nws txoj kev thaiv cov hluav taws xob tsaus ntuj ntawm chav tsev kub thiab kev nqus tau zoo ntawm cov neeg nqa khoom photogenerated, lub tshuab ntes no yog qhov tsim nyog rau kev ntes cov teeb liab tsis muaj zog hauv cov teb xws li kev saib xyuas ib puag ncig, kev soj ntsuam hnub qub, thiab kev sib txuas lus optical. Qhov kev tshawb fawb no tsis yog tsuas yog muab cov tswv yim tshiab rau kev tsim cov khoom siv photodetectors qis-dimensional, tab sis kuj muab cov ntaub ntawv tshiab rau kev tshawb fawb yav tom ntej thiab kev txhim kho ntawm cov khoom siv optoelectronic ua tau zoo thiab qis-zog.