Ucwaningo lwakamuva lwei-avalanche photodetector
Ubuchwepheshe bokutholwa kwe-infrared busetshenziswa kakhulu ekuhloleni amasosha, ukuqapha indawo ezungezile, ukuhlonzwa kwezempilo kanye neminye imikhakha. Izitholi ze-infrared zendabuko zinemikhawulo ethile ekusebenzeni, njengokuzwela kokubona, isivinini sokuphendula nokunye. Izinto ze-InAs/InAsSb Class II superlattice (T2SL) zinezinto ezinhle kakhulu ze-photoelectric kanye nokushibilika, okuzenza zilungele izitholi ze-infrared (LWIR) zamagagasi amade. Inkinga yokusabela okubuthakathaka ekutholweni kwe-infrared yamagagasi amade kube yinto ekhathazayo isikhathi eside, ebeka umkhawulo kakhulu ekuthembekeni kwezinhlelo zokusebenza zedivayisi ye-elekthronikhi. Nakuba i-avalanche photodetector (Isitholi sesithombe se-APD) inokusebenza okuhle kakhulu kokuphendula, ihlushwa amandla amnyama aphezulu ngesikhathi sokuphindaphinda.
Ukuze kuxazululwe lezi zinkinga, ithimba elivela e-University of Electronic Science and Technology yase-China liklame ngempumelelo i-Class II superlattice (T2SL) ye-infrared avalanche photodiode (APD) ye-infrared avalanche ye-long-wave yamagagasi amade (APD). Abacwaningi basebenzise izinga eliphansi lokuhlanganisa kabusha kwe-auger yesendlalelo se-InAs/InAsSb T2SL esidonsa ukuze kwehliswe ubumnyama bamanje. Ngesikhathi esifanayo, i-AlAsSb enevelu engu-k ephansi isetshenziswa njengesendlalelo sokuphindaphinda ukucindezela umsindo wedivayisi ngenkathi igcina inzuzo eyanele. Lo mklamo uhlinzeka ngesixazululo esithembisayo sokuthuthukisa ukuthuthukiswa kobuchwepheshe bokubona i-infrared wave. Umtshina wamukela idizayini enezigaba ezinezinyathelo, futhi ngokulungisa isilinganiso sokwakheka kwe-InAs ne-InAsSb, ukuguquguquka okushelelayo kwesakhiwo sebhendi kuyafinyelelwa, nokusebenza komtshina kuyathuthukiswa. Mayelana nokukhethwa kwempahla kanye nenqubo yokulungiselela, lolu cwaningo luchaza ngokuningiliziwe indlela yokukhula kanye nemingcele yenqubo ye-InAs/InAsSb T2SL impahla esetshenziswa ukulungisa umtshina. Ukunquma ukwakheka nokujiya kwe-InAs/InAsSb T2SL kubalulekile futhi ukulungiswa kwepharamitha kuyadingeka ukuze kuzuzwe ibhalansi yokucindezeleka. Kumongo wokutholwa kwe-infrared yamagagasi amade, ukuze ufinyelele ubude begagasi obunqamuliwe obufanayo njenge-InAs/GaSb T2SL, kudingeka isikhathi esisodwa se-InAs/InAsSb T2SL esijiyile. Kodwa-ke, i-monocycle ewugqinsi iphumela ekwehleni kwe-coefficient yokumunca lapho kuya khona ukukhula kanye nokwanda kwenqwaba esebenzayo yezimbobo ku-T2SL. Kutholwe ukuthi ukwengeza ingxenye ye-Sb kungafinyelela ubude begagasi be-cutoff ende ngaphandle kokukhulisa ngokuphawulekayo ukushuba kwesikhathi esisodwa. Kodwa-ke, ukwakheka kwe-Sb ngokweqile kungaholela ekuhlukaniseni izakhi ze-Sb.
Ngakho-ke, i-InAs/InAs0.5Sb0.5 T2SL eneqembu le-Sb 0.5 ikhethiwe njengongqimba olusebenzayo lwe-APDi-photodetector. I-InAs/InAsSb T2SL ikhula ngokuyinhloko kuma-substrates e-GaSb, ngakho indima ye-GaSb ekulawuleni ubunzima idinga ukucatshangelwa. Empeleni, ukuzuza ukulingana kobunzima kuhilela ukuqhathanisa isilinganiso se-lattice esingaguquki se-superlattice isikhathi esisodwa nokungaguquki kwe-lattice ye-substrate. Ngokuvamile, i-tensile strain ku-InAs inxeshezelwa uhlobo olucindezelayo olwethulwe yi-InAsSb, okuholela kungqimba lwe-InAs olujiyile kunolwendlalelo lwe-InAsSb. Lolu cwaningo lulinganise izici zokusabela zikagesi wesithombe ze-avalanche photodetector, okuhlanganisa impendulo ye-spectral, i-dark current, umsindo, njll., futhi laqinisekisa ukusebenza kahle kwedizayini yesendlalelo se-gradient. Umthelela wokuphindaphindeka kwe-avalanche we-avalanche photodetector uyahlaziywa, futhi ubudlelwano phakathi kwesici sokuphindaphinda namandla okukhanya kwesigameko, izinga lokushisa kanye namanye amapharamitha kuyaxoxwa.
I-FIG. (A) Umdwebo wohlelo lwe-InAs/InAsSb yesithwebuli sesithombe se-infrared APD se-infrared; (B) Umdwebo ohleliwe wezinkambu zikagesi kusendlalelo ngasinye se-APD photodetector.
Isikhathi sokuthumela: Jan-06-2025