Bipolar ob-dimensional avalanche photodetector

Bipolar ob-dimensionalLub avalanche photodetector

Lub bipolar ob-dimensional avalanche photodetector (APD photodetector) ua tiav lub suab nrov qis thiab siab rhiab heev

High-rhiab heev nrhiav tau ntawm ob peb photons los yog ib tug photons ib qho tseem ceeb daim ntawv thov kev cia siab nyob rau hauv cov teb xws li tsis muaj zog lub teeb pom kev zoo, tej thaj chaw deb sensing thiab telemetry, thiab quantum kev sib txuas lus. Ntawm lawv, avalanche photodetector (APD) tau dhau los ua ib qho tseem ceeb hauv kev tshawb fawb ntawm optoelectronic ntaus ntawv vim nws cov yam ntxwv ntawm qhov me me, kev ua haujlwm siab thiab kev sib koom ua ke yooj yim. Lub teeb liab-rau-nruj piv (SNR) yog qhov taw qhia tseem ceeb ntawm APD photodetector, uas yuav tsum tau nce siab thiab qis qis tam sim no. Kev tshawb fawb ntawm van der Waals heterojunctions ntawm ob-dimensional (2D) cov ntaub ntawv qhia dav dav hauv kev txhim kho cov kev ua tau zoo APDs. Cov kws tshawb fawb los ntawm Tuam Tshoj tau xaiv cov khoom siv bipolar ob-dimensional semiconductor WSe₂ ua cov khoom siv photosensitive thiab ua tib zoo npaj APD photodetector nrog Pt / Wse₂ / Ni qauv uas muaj qhov zoo tshaj plaws kev ua haujlwm zoo, txhawm rau daws qhov teeb meem nce suab nrov ntawm cov tsoos APD photodetector.

Pab neeg tshawb fawb tau thov kom muaj lub avalanche photodetector raws li tus qauv Pt / Wse₂ / Ni, uas tau ua tiav qhov kev tshawb pom ntawm lub teeb tsis muaj zog heev ntawm fW theem ntawm chav tsev kub. Lawv xaiv cov khoom siv ob-dimensional semiconductor WSe₂, uas muaj cov khoom siv hluav taws xob zoo, thiab ua ke cov ntaub ntawv Pt thiab Ni electrode kom ua tiav ib hom tshiab ntawm avalanche photodetector. Los ntawm kev ua kom zoo dua qhov ua haujlwm zoo sib xws ntawm Pt, WSe₂ thiab Ni, lub tshuab thauj khoom tau tsim los uas tuaj yeem thaiv cov neeg nqa khoom tsaus nti thaum xaiv cov neeg nqa khoom photogenerated hla dhau. Cov txheej txheem no txo ​​cov suab nrov dhau los ntawm cov cab kuj cuam tshuam ionization, ua kom lub photodetector ua tiav cov teeb pom kev zoo kho qhov muag pom ntawm qhov tsis tshua muaj suab nrov.

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

Cov txiaj ntsig kev sim qhia tau hais tias Pt / Wse₂ / Ni detector nthuav tawm lub suab nrov tsis tshua muaj zog sib npaug (NEP) ntawm chav tsev kub, uas tsuas yog 8.07 fW / √Hz. Qhov no txhais tau hais tias tus ntes tuaj yeem txheeb xyuas cov teeb meem kho qhov muag tsis muaj zog. Tsis tas li ntawd, cov cuab yeej no tuaj yeem ua haujlwm ruaj khov ntawm qhov kev hloov pauv zaus ntawm 20 kHz nrog qhov nce siab ntawm 5 × 10⁵, ua tiav kev daws teeb meem ntawm cov khoom siv hluav taws xob photovoltaic uas nyuaj rau kev sib npaug siab thiab bandwidth. Qhov no feature yuav tsum muab nws nrog cov txiaj ntsig tseem ceeb hauv cov ntawv thov uas xav tau kev nce siab thiab qis suab nrov.

Qhov kev tshawb fawb no qhia txog lub luag haujlwm tseem ceeb ntawm cov khoom siv engineering thiab kev sib txuas kom zoo hauv kev txhim kho kev ua haujlwm ntawmphotodetectors. Los ntawm ingenious tsim ntawm electrodes thiab ob-seem cov ntaub ntawv, ib tug shielding nyhuv ntawm cov neeg nqa khoom tsaus tau ua tiav, txo cov suab nrov cuam tshuam thiab ntxiv txhim kho kev tshawb nrhiav efficiency.

Qhov kev ua tau zoo ntawm lub tshuab ntes no tsis yog tsuas yog cuam tshuam nrog cov yam ntxwv ntawm photoelectric, tab sis kuj muaj cov ntawv thov dav dav. Nrog nws txoj kev thaiv qhov tsaus nti tam sim no ntawm chav tsev kub thiab kev nqus tau zoo ntawm cov neeg nqa khoom photogenerated, qhov ntsuas no tshwj xeeb yog tsim rau kev kuaj pom lub teeb tsis muaj zog hauv thaj chaw xws li kev saib xyuas ib puag ncig, kev soj ntsuam hnub qub, thiab kev sib txuas lus kho qhov muag. Qhov kev tshawb fawb tau ua tiav no tsis tsuas yog muab cov tswv yim tshiab rau kev txhim kho cov khoom siv hluav taws xob tsawg-dimensional photodetectors, tab sis kuj muaj cov ntaub ntawv tshiab rau kev tshawb fawb yav tom ntej thiab kev txhim kho cov kev ua tau zoo thiab cov khoom siv hluav taws xob qis.