Kafukufuku waposachedwa wa chipangizo chowunikira kuwala kwa dzuwa

Kafukufuku waposachedwa wachowunikira zithunzi cha chipale chofewa

Ukadaulo wozindikira ma infrared umagwiritsidwa ntchito kwambiri pofufuza zankhondo, kuyang'anira chilengedwe, kuzindikira matenda ndi zina. Zipangizo zodziwira ma infrared zakale zimakhala ndi zofooka zina pakugwira ntchito, monga kuzindikira, liwiro la kuyankha ndi zina zotero. Zipangizo za InAs/InAsSb Class II superlattice (T2SL) zili ndi mphamvu zabwino kwambiri zamagetsi komanso kuthekera kosintha, zomwe zimapangitsa kuti zikhale zoyenera kwambiri pozindikira ma infrared a mafunde aatali (LWIR). Vuto la kuyankha kofooka pakuzindikira ma infrared a mafunde aatali lakhala likudetsa nkhawa kwa nthawi yayitali, zomwe zimachepetsa kwambiri kudalirika kwa ntchito zamagetsi. Ngakhale kuti chowunikira ma avalanche (Chowunikira zithunzi cha APD) ili ndi mphamvu yabwino kwambiri yoyankhira, imakhala ndi mdima wambiri panthawi yochulukitsa.

Pofuna kuthetsa mavutowa, gulu lochokera ku University of Electronic Science and Technology of China lapanga bwino chipangizo cha infrared avalanche photodiode (APD) chapamwamba kwambiri cha Class II superlattice (T2SL). Ofufuzawa adagwiritsa ntchito kuchuluka kwa infrared recombination rate (APD) cha InAs/InAsSb T2SL absorber layer kuti achepetse mphamvu yakuda. Nthawi yomweyo, AlAsSb yokhala ndi mtengo wotsika wa k imagwiritsidwa ntchito ngati chowonjezera kuti ichepetse phokoso la chipangizocho pamene ikusunga kuchuluka kokwanira. Kapangidwe kameneka kamapereka njira yabwino yolimbikitsira chitukuko cha ukadaulo wozindikira infrared wave yayitali. Chowunikiracho chimagwiritsa ntchito kapangidwe ka masitepe, ndipo posintha chiŵerengero cha kapangidwe ka InAs ndi InAsSb, kusintha kosalala kwa kapangidwe ka gulu kumachitika, ndipo magwiridwe antchito a chowunikira amawongoleredwa. Ponena za kusankha zinthu ndi njira yokonzekera, kafukufukuyu akufotokoza mwatsatanetsatane njira yokulira ndi magawo a njira ya InAs/InAsSb T2SL yomwe imagwiritsidwa ntchito kukonzekera chowunikira. Kudziwa kapangidwe ndi makulidwe a InAs/InAsSb T2SL ndikofunikira kwambiri ndipo kusintha kwa magawo kumafunika kuti pakhale kupsinjika bwino. Pankhani yozindikira ma infrared a mafunde aatali, kuti mupeze kutalika kwa mafunde komweko monga InAs/GaSb T2SL, nthawi imodzi ya InAs/InAsSb T2SL yokhuthala imafunika. Komabe, nthawi imodzi yokhuthala imapangitsa kuti kuchepa kwa mayamwidwe kukhale kofunikira poyambira kukula komanso kuwonjezeka kwa kuchuluka kwa mabowo mu T2SL. Zapezeka kuti kuwonjezera gawo la Sb kumatha kukhala kutalika kwa mafunde popanda kuwonjezera makulidwe a nthawi imodzi. Komabe, kuchuluka kwa Sb kungayambitse kulekanitsidwa kwa zinthu za Sb.

Chifukwa chake, InAs/InAs0.5Sb0.5 T2SL yokhala ndi gulu la Sb 0.5 idasankhidwa ngati gawo logwira ntchito la APDchowunikira zithunziInAs/InAsSb T2SL imakula makamaka pa ma substrates a GaSb, kotero udindo wa GaSb pakuwongolera kupsinjika uyenera kuganiziridwa. Kwenikweni, kukwaniritsa kuyanjana kwa kupsinjika kumaphatikizapo kuyerekeza kusinthasintha kwapakati kwa lattice ya superlattice kwa nthawi imodzi ndi kusinthasintha kwa lattice ya substrate. Kawirikawiri, kupsinjika kwa InAs kumalipidwa ndi kupsinjika komwe kumayambitsidwa ndi InAsSb, zomwe zimapangitsa kuti InAs ikhale yokhuthala kuposa InAsSb. Kafukufukuyu anayeza mawonekedwe a photoelectric response a avalanche photodetector, kuphatikiza spectral response, dark current, noise, etc., ndipo adatsimikizira kugwira ntchito kwa kapangidwe ka step gradient layer. Mphamvu ya avalanche multiplication ya avalanche photodetector imasanthulidwa, ndipo ubale pakati pa multiplication factor ndi incident light power, kutentha ndi zina zikukambidwa.

CHITHUNZI (A) Chithunzi cha InAs/InAsSb chowunikira zithunzi cha infrared APD cha mafunde aatali; (B) Chithunzi cha InAsSb cha magetsi pa gawo lililonse la chowunikira zithunzi cha APD.