Sabbin binciken da aka yi na avalanche photodetector

The latest bincike nadusar ƙanƙara mai daukar hoto

Ana amfani da fasahar gano infrared sosai a cikin binciken soja, sa ido kan muhalli, ganewar asibiti da sauran fannoni. Na'urorin gano infrared na gargajiya suna da wasu iyakoki a cikin aiki, kamar gano hankali, saurin amsawa da sauransu. InAs/InAsSb Class II superlattice (T2SL) kayan suna da ingantattun kaddarorin lantarki da daidaitawa, yana mai da su manufa don masu gano infrared mai tsayi (LWIR). Matsalar raunin amsawa a cikin tsinkayar infrared mai tsayi ya kasance damuwa na dogon lokaci, wanda ke iyakance amincin aikace-aikacen na'urar lantarki. Ko da yake dusar ƙanƙara mai ɗaukar hoto (APD photodetector) yana da kyakkyawan aikin amsawa, yana fama da matsanancin duhu a lokacin haɓaka.

Don magance wadannan matsalolin, wata tawagar jami'ar kimiyya da fasaha ta kasar Sin ta yi nasarar kera wani babban aiki mai inganci Class II superlatice (T2SL) mai dogon igiyar ruwa infrared avalanche photodiode (APD). Masu binciken sun yi amfani da ƙananan ƙimar sake haɗawa na InAs/InAsSb T2SL absorber Layer don rage duhu halin yanzu. A lokaci guda, ana amfani da AlAsSb tare da ƙananan ƙimar k azaman Layer mai ninka don murkushe hayaniyar na'urar yayin da ake samun isasshen riba. Wannan ƙirar tana ba da mafita mai ban sha'awa don haɓaka haɓaka fasahar gano infrared mai tsayi. Mai ganowa yana ɗaukar ƙirar ƙira mai tsayi, kuma ta daidaita daidaitattun abubuwan InAs da InAsSb, ana samun sauƙin tsarin tsarin band, kuma ana haɓaka aikin mai ganowa. Dangane da zaɓin kayan abu da tsarin shirye-shiryen, wannan binciken ya bayyana dalla-dalla hanyar haɓakawa da sigogin tsari na kayan InAs/InAsSb T2SL da aka yi amfani da su don shirya mai ganowa. Ƙayyade abun da ke ciki da kauri na InAs/InAsSb T2SL yana da mahimmanci kuma ana buƙatar daidaita ma'aunin don cimma daidaiton damuwa. A cikin mahallin gano infrared mai tsayi mai tsayi, don cimma tsayin yanke-kashe kamar InAs/GaSb T2SL, ana buƙatar lokacin InAs/InAsSb T2SL mai kauri. Duk da haka, kauri monocycle yana haifar da raguwa a cikin ƙididdiga masu yawa a cikin jagorancin girma da karuwa a cikin tasiri mai yawa na ramuka a cikin T2SL. An gano cewa ƙara bangaren Sb na iya cimma tsayin daka mai tsayi ba tare da haɓaka kauri ɗaya ba. Koyaya, yawan abubuwan Sb na iya haifar da rarrabuwa na abubuwan Sb.

Don haka, an zaɓi InAs/InAs0.5Sb0.5 T2SL tare da ƙungiyar Sb 0.5 azaman Layer mai aiki na APD.mai daukar hoto. InAs/InAsSb T2SL ya fi girma akan kayan aikin GaSb, don haka ana buƙatar yin la'akari da rawar GaSb a cikin sarrafa iri. Mahimmanci, samun ma'auni mai ma'ana ya haɗa da kwatanta matsakaicin matsakaitan lattice na wani babban ɗaki na tsawon lokaci ɗaya zuwa madaidaicin lattice na substrate. Gabaɗaya, nau'in juzu'i a cikin InAs yana ramawa ta nau'in matsawa da InAsSb ya gabatar, yana haifar da kauri InAs fiye da Layer InAsSb. Wannan binciken ya auna halayen amsawar hoto na mai gano hoto na avalanche, gami da martanin kallo, duhu mai duhu, hayaniya, da sauransu, kuma ya tabbatar da ingancin ƙirar ƙirar gradient ɗin da aka tako. Ana nazarin tasirin haɓakar bala'in bala'i na avalanche photodetector, kuma an tattauna alaƙar da ke tsakanin abubuwan haɓakawa da ƙarfin hasken da ya faru, zazzabi da sauran sigogi.

FIG. (A) Tsarin tsari na InAs/InAsSb mai ɗaukar hoto mai infrared mai tsayi mai tsayi; (B) Zane-zane na filayen lantarki a kowane Layer na APD photodetetector.