Ucwaningo lwakamuva lwe-umshini wokuthola izithombe we-avalanche
Ubuchwepheshe bokuthola i-infrared busetshenziswa kabanzi ekuhloleni kwezempi, ukuqapha imvelo, ukuxilongwa kwezokwelapha kanye neminye imikhakha. Ama-infrared detector endabuko anemikhawulo ethile ekusebenzeni, njengokuzwela kokuthola, isivinini sokuphendula njalonjalo. Izinto ze-InAs/InAsSb Class II superlattice (T2SL) zinezakhiwo ezinhle kakhulu ze-photoelectric kanye nokulungiswa, okwenza zilungele ama-infrared infrared (LWIR) amagagasi amade. Inkinga yokusabela okubuthakathaka ekutholeni i-infrared yamagagasi amade ibilokhu iyinkinga isikhathi eside, okunciphisa kakhulu ukuthembeka kwezinhlelo zokusebenza zedivayisi kagesi. Nakuba i-avalanche photodetector (Isitholi sezithombe se-APD) inokusebenza okuhle kakhulu kokuphendula, ihlushwa ugesi omnyama ophezulu ngesikhathi sokuphindaphindwa.
Ukuze kuxazululwe lezi zinkinga, ithimba elivela eNyuvesi Yesayensi Yezobuchwepheshe Nezobuchwepheshe baseShayina liphumelele ukuklama i-photodiode ye-infrared ye-Class II superlattice (T2SL) ye-long-wave infrared avalanche (APD) (APD) esebenza kahle kakhulu. Abacwaningi basebenzise izinga eliphansi lokuhlanganisa i-auger lesendlalelo se-InAs/InAsSb T2SL ukuze banciphise ugesi omnyama. Ngesikhathi esifanayo, i-AlAsSb enenani eliphansi le-k isetshenziswa njengesendlalelo sokuphindaphinda ukucindezela umsindo wedivayisi ngenkathi igcina inzuzo eyanele. Lo mklamo unikeza ikhambi elithembisayo lokukhuthaza ukuthuthukiswa kobuchwepheshe bokuthola i-infrared yamaza amade. I-detector isebenzisa umklamo osezingeni elihamba phambili, futhi ngokulungisa isilinganiso sokwakheka kwe-InAs ne-InAsSb, ukuguqulwa okubushelelezi kwesakhiwo sebhendi kuyafezwa, futhi ukusebenza kwe-detector kuyathuthukiswa. Ngokuphathelene nokukhethwa kwezinto kanye nenqubo yokulungiselela, lolu cwaningo luchaza ngokuningiliziwe indlela yokukhula kanye nemingcele yenqubo yezinto ze-InAs/InAsSb T2SL ezisetshenziselwa ukulungiselela i-detector. Ukunquma ukwakheka kanye nobukhulu be-InAs/InAsSb T2SL kubalulekile futhi ukulungiswa kwamapharamitha kuyadingeka ukuze kufezwe ibhalansi yokucindezeleka. Uma kukhulunywa ngokutholwa kwe-infrared yamagagasi amade, ukuze kufezwe ubude be-wavelength obufanayo ne-InAs/GaSb T2SL, kudingeka isikhathi esisodwa se-InAs/InAsSb T2SL obukhulu. Kodwa-ke, i-monocycle ekhuluphele iholela ekunciphiseni kwe-coefficient yokumunca ekuqondeni kokukhula kanye nokwanda kwesisindo esisebenzayo semigodi ku-T2SL. Kutholakale ukuthi ukwengeza ingxenye ye-Sb kungafeza ubude be-wavelength obude ngaphandle kokwandisa kakhulu ubukhulu besikhathi esisodwa. Kodwa-ke, ukwakheka kwe-Sb ngokweqile kungaholela ekuhlukanisweni kwezakhi ze-Sb.
Ngakho-ke, i-InAs/InAs0.5Sb0.5 T2SL eneqembu le-Sb elingu-0.5 ikhethiwe njengesendlalelo esisebenzayo se-APDumshini wokuthola izithombe. I-InAs/InAsSb T2SL ikhula kakhulu kuma-substrate e-GaSb, ngakho-ke indima ye-GaSb ekuphathweni kokucindezeleka idinga ukucatshangelwa. Empeleni, ukufeza ukulingana kokucindezeleka kuhilela ukuqhathanisa i-lattice constant ejwayelekile ye-superlattice isikhathi esisodwa ne-lattice constant ye-substrate. Ngokuvamile, i-tensile strain ku-InAs ikhokhelwa yi-compressive strain eyethulwa yi-InAsSb, okuholela kungqimba lwe-InAs olujiyile kunengqimba ye-InAsSb. Lolu cwaningo lulinganise izici zempendulo ye-photoelectric ye-avalanche photodetector, kufaka phakathi impendulo ye-spectral, i-dark current, umsindo, njll., futhi lwaqinisekisa ukusebenza kahle komklamo wengqimba ye-gradient ezinyathelo. Umphumela wokuphindaphinda kwe-avalanche we-avalanche photodetector uyahlaziywa, futhi kuxoxwa ngobudlelwano phakathi kwe-multiplication factor kanye namandla okukhanya kwesigameko, izinga lokushisa kanye nezinye izilinganiso.
UMFANELO (A) Umdwebo weskimu we-InAs/InAsSb long-wave infrared APD photodetector; (B) Umdwebo weskimu wezinkundla zikagesi kungqimba ngayinye ye-APD photodetector.
Isikhathi sokuthunyelwe: Jan-06-2025