Kafukufuku waposachedwa wa avalanche photodetector

Kafukufuku waposachedwa waPhotodetector ya avalanche

Ukadaulo wozindikira ma infrared umagwiritsidwa ntchito kwambiri pakuwunikiranso zankhondo, kuyang'anira chilengedwe, kuzindikira zachipatala ndi zina. Zowunikira zachikhalidwe za infrared zimakhala ndi zoletsa zina pakuchita, monga kuzindikira, kuthamanga kwa mayankhidwe ndi zina zotero. Zida za InAs/InAsSb Class II superlattice (T2SL) zili ndi mawonekedwe abwino kwambiri azithunzi komanso kusinthika, zomwe zimawapangitsa kukhala abwino kwa zowunikira zazitali za infrared (LWIR). Vuto la kuyankha kofooka pakuzindikira kwakutali kwa infrared lakhala likudetsa nkhawa kwa nthawi yayitali, zomwe zimachepetsa kwambiri kudalirika kwa zida zamagetsi zamagetsi. Ngakhale avalanche photodetector (APD Photodetector) imakhala ndi magwiridwe antchito abwino kwambiri, imakhala ndi mphamvu yakuda kwambiri pakuchulukitsa.

Kuti athetse mavutowa, gulu lochokera ku yunivesite ya Electronic Science and Technology ya ku China lapanga bwino makina apamwamba kwambiri a Class II superlattice (T2SL) a long-wave infrared avalanche photodiode (APD). Ofufuzawo adagwiritsa ntchito kutsika kwapang'onopang'ono kwa inAs/InAsSb T2SL absorber kuti achepetse mdima wapano. Panthawi imodzimodziyo, AlAsSb yokhala ndi mtengo wotsika wa k imagwiritsidwa ntchito ngati chowonjezera chopondereza phokoso la chipangizo ndikusunga phindu lokwanira. Kapangidwe kameneka kamapereka njira yodalirika yolimbikitsira chitukuko chaukadaulo wautali wa infrared. Chowunikiracho chimatengera kapangidwe kake kolowera, ndipo posintha kuchuluka kwa ma InAs ndi InAsSb, kusintha kosalala kwa gulu la bandi kumatheka, ndipo magwiridwe antchito a chowunikira amakhala bwino. Pankhani yosankha zinthu komanso kukonzekera, phunziroli likufotokoza mwatsatanetsatane njira yakukula ndi magawo azinthu za InAs/InAsSb T2SL zomwe zimagwiritsidwa ntchito pokonzekera chowunikira. Kuzindikira kapangidwe kake ndi makulidwe a InAs/InAsSb T2SL ndikofunikira ndipo kusintha kwa magawo ndikofunikira kuti mukwaniritse kupsinjika. Pankhani ya kuzindikira kwakutali kwa infrared, kuti mukwaniritse kutalika kofananako kofanana ndi InAs/GaSb T2SL, nthawi imodzi yokulirapo ya InAs/InAsSb T2SL ikufunika. Komabe, monocycle wandiweyani kumabweretsa kuchepa kwa mayamwidwe koyenelera ku mbali ya kukula ndi kuwonjezeka ogwira unyinji wa mabowo mu T2SL. Zimapezeka kuti kuwonjezera gawo la Sb kumatha kukwaniritsa kutalika kwa kutalika kwa mawonekedwe popanda kukulitsa makulidwe a nthawi imodzi. Komabe, kuchuluka kwa Sb kungayambitse kulekanitsa zinthu za Sb.

Chifukwa chake, InAs/InAs0.5Sb0.5 T2SL yokhala ndi Sb gulu 0.5 idasankhidwa kukhala gawo logwira ntchito la APD.Photodetector. InAs/InAsSb T2SL makamaka imakula pagawo la GaSb, kotero gawo la GaSb pakuwongolera zovuta liyenera kuganiziridwa. M'malo mwake, kukwanitsa kufananiza kuphatikizira kufananiza kuchuluka kwa lattice kwapamwamba kwambiri kwa nthawi imodzi ndi kusinthasintha kwa gawo lapansi. Nthawi zambiri, kupsinjika kwamphamvu mu InAs kumalipidwa ndi kupsinjika komwe kumayambitsidwa ndi InAsSb, zomwe zimapangitsa kuti InAs ikhale yochulukirapo kuposa InAsSb wosanjikiza. Kafukufukuyu anayeza mawonekedwe a kuyankha kwa ma photoelectric a avalanche photodetector, kuphatikiza kuyankha kwa spectral, mdima wakuda, phokoso, ndi zina zotero, ndikutsimikizira mphamvu ya kapangidwe ka gradient. Kuchulukitsitsa kwa avalanche kwa photodetector ya avalanche kumawunikidwa, ndipo ubale pakati pa chochulutsa ndi mphamvu ya kuwala kwa chochitika, kutentha ndi magawo ena akukambidwa.

CHITH. (A) Chithunzi chojambula cha InAs/InAsSb chakutali cha infrared APD photodetector; (B) Chithunzi chojambula cha minda yamagetsi pagawo lililonse la APD photodetector.