Kafukufuku Watsopano pa Chowunikira Zithunzi cha Avalanche Chotsika

Kafukufuku Watsopano pa Chowunikira Zithunzi cha Avalanche Chotsika

Kuzindikira kwambiri ukadaulo wa photon yochepa kapena ngakhale single-photon kumathandizira kwambiri pakugwiritsa ntchito zinthu monga kujambula zithunzi zopepuka pang'ono, kuzindikira kutali ndi telemetry, komanso kulumikizana kwa quantum. Pakati pa izi, zowonera zithunzi za avalanche (APD) zakhala njira yofunika kwambiri yofufuzira zida zamagetsi chifukwa cha kukula kwawo kochepa, kugwira ntchito bwino kwambiri komanso kuphatikiza kosavuta. Chizindikiro-ku-phokoso (SNR) ndi chizindikiro chofunikira cha APD Photodetector, chomwe chimafuna kuchuluka kwakukulu komanso mphamvu yamdima yochepa. Kafukufuku wa zinthu zamitundu iwiri (2D) van der Waals heterojunctions akuwonetsa kuthekera kwakukulu pakupanga ma APD ogwira ntchito kwambiri. Ofufuza ochokera ku China adasankha zinthu za bipolar two-dimensional semiconductor WSe₂ ngati zinthu zowunikira kuwala ndipo adakonza mosamala kapangidwe ka Pt/WSe₂/Ni.Chowunikira Chithunzi cha APDndi ntchito yabwino kwambiri yofananira kuti athetse vuto la phokoso la APD yachikhalidwe lomwe limayambitsa phokoso.

Ofufuza apereka lingaliro lachowunikira zithunzi cha chipale chofewaKutengera kapangidwe ka Pt/WSe₂/Ni, kupeza kuzindikira kwamphamvu kwambiri kwa zizindikiro zofooka kwambiri pamlingo wa fW kutentha kwa chipinda. Anasankha WSe₂ ya semiconductor yokhala ndi magawo awiri, yomwe ili ndi mphamvu zamagetsi zabwino kwambiri, ndipo adaiphatikiza ndi zinthu za Pt ndi Ni electrode kuti apange bwino mtundu watsopano wa chowunikira cha avalanche. Mwa kukonza bwino ntchito yogwirizana pakati pa Pt, WSe₂ ndi Ni, njira yonyamulira idapangidwa yomwe ingatseke bwino zonyamulira zakuda pomwe imalola zonyamulira zopangidwa ndi photocallers kudutsa. Njirayi imachepetsa kwambiri phokoso lochulukirapo lomwe limayambitsidwa ndi ionization ya carrier impact, zomwe zimathandiza chowunikira photocaller kupeza kuzindikira kwamphamvu kwambiri kwa chizindikiro cha optical pamlingo wotsika kwambiri wa phokoso.

Kafukufukuyu akuwonetsa ntchito yofunika kwambiri ya uinjiniya wa zinthu ndi kukonza mawonekedwe a mawonekedwe pakukweza magwiridwe antchito ama photodetectorsKudzera mu kapangidwe kanzeru ka ma electrode ndi zipangizo zokhala ndi miyeso iwiri, mphamvu yoteteza ya zonyamulira zamdima idakwaniritsidwa, kuchepetsa kwambiri kusokoneza phokoso ndikuwongolera bwino kuzindikira. Kugwira ntchito kwa chowunikira ichi sikungowoneka kokha m'makhalidwe ake a photoelectric, komanso kumathandizira kugwiritsa ntchito bwino. Chifukwa choletsa bwino mphamvu yamdima kutentha kwa chipinda komanso kuyamwa bwino kwa zonyamulira zopangidwa ndi photo, chowunikira ichi ndi choyenera kwambiri kuzindikira zizindikiro zofooka za kuwala m'magawo monga kuyang'anira chilengedwe, kuwona zakuthambo, ndi kulumikizana kwa kuwala. Kupambana kwa kafukufukuyu sikungopereka malingaliro atsopano pakupanga zowunikira zazithunzi zazithunzi zochepa, komanso kumapereka maumboni atsopano a kafukufuku wamtsogolo ndi chitukuko cha zida zamagetsi zamagetsi zogwira ntchito kwambiri komanso zochepa.