Kev Tshawb Fawb Tshiab ntawm Low-dimensional Avalanche Photodetector

Kev Tshawb Fawb Tshiab ntawm Low-dimensional Avalanche Photodetector

Kev tshawb pom qhov rhiab heev ntawm ob peb-photon lossis txawm tias ib-photon thev naus laus zis muaj kev cia siab rau kev siv hauv cov teb xws li kev thaij duab tsawg-lub teeb, kev tshawb nrhiav chaw deb thiab telemetry, nrog rau kev sib txuas lus quantum. Ntawm lawv, avalanche photodetectors (APD) tau dhau los ua ib qho kev taw qhia tseem ceeb hauv kev tshawb fawb txog cov khoom siv optoelectronic vim lawv 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 tsawg. Kev tshawb fawb ntawm ob-seem (2D) cov khoom siv van der Waals heterojunctions 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 ua tib zoo npaj cov qauv Pt / WSe₂ / Ni.APD Photodetectornrog rau qhov kev ua haujlwm zoo tshaj plaws los daws qhov teeb meem suab nrov ntawm APD ib txwm muaj.

Cov kws tshawb nrhiav tau tawm tswv yim ib qholub tshuab ntes duab av qeegraws li Pt/WSe₂/Ni qauv, ua tiav qhov kev tshawb pom qhov muag pom kev tsis muaj zog heev ntawm qib fW ntawm chav sov. Lawv tau xaiv cov khoom siv semiconductor ob-seem WSe₂, uas muaj cov khoom siv hluav taws xob zoo heev, thiab ua ke nrog cov khoom siv electrode Pt thiab Ni kom ua tiav kev tsim hom tshiab ntawm avalanche photodetector. 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 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 photodetector ua tiav qhov kev tshawb pom qhov muag pom kev zoo heev ntawm qib suab nrov qis heev.

Txoj 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 khoom siv 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 nrhiav. Kev ua tau zoo ntawm lub tshuab ntes no tsis yog tsuas yog pom hauv nws cov yam ntxwv photoelectric xwb, tab sis kuj muaj kev cia siab dav dav. Nrog nws txoj kev thaiv cov teeb pom kev tsaus ntuj ntawm qhov kub thiab txias thiab kev nqus tau zoo ntawm cov neeg nqa khoom photogenerated, lub photodetector no tshwj xeeb tshaj yog rau kev tshawb pom 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-seem, 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.