Babban aiki mai sarrafa kansainfrared photodetector
infraredmai daukar hotoyana da halaye na ƙarfin hana tsangwama mai ƙarfi, ƙarfin ganewa mai ƙarfi, aiki duk yanayin yanayi da kyakkyawan ɓoyewa. Yana kara taka muhimmiyar rawa a fannoni kamar likitanci, soja, fasahar sararin samaniya da injiniyan muhalli. Daga cikinsu, masu sarrafa kansugano wutar lantarkiguntu wanda zai iya aiki da kansa ba tare da ƙarin samar da wutar lantarki na waje ya jawo hankali mai yawa a fagen gano infrared saboda aikinsa na musamman (kamar 'yancin kai na makamashi, babban hankali da kwanciyar hankali, da sauransu). Sabanin haka, guntu na gano na'urorin lantarki na gargajiya, irin su siliki-based ko narrowbandgap semiconductor-based infrared chips, ba wai kawai suna buƙatar ƙarin ƙarfin wutar lantarki don fitar da rarrabuwa na masu ɗaukar hoto don samar da hotunan hoto ba, amma kuma suna buƙatar ƙarin tsarin sanyaya don rage amo mai zafi da haɓaka amsawa. Sabili da haka, ya zama da wahala don saduwa da sababbin ra'ayoyi da buƙatun na gaba na ƙirar infrared gano kwakwalwan kwamfuta a nan gaba, kamar ƙananan amfani da wutar lantarki, ƙananan ƙananan, ƙananan farashi da babban aiki.
Kwanan nan, ƙungiyoyin bincike daga China da Sweden sun ba da shawarar sabon guntun gano guntun infrared mai sarrafa kansa (SWIR) wanda ya dogara da fina-finai na graphene nanoribbon (GNR)/alumina/ silicon crystal silicon. Ƙarƙashin haɗakar tasirin tasirin gating na gani wanda ke haifar da keɓancewa daban-daban da kuma ginanniyar filin lantarki, guntu ya nuna babban martani da aikin ganowa a sifilin wutar lantarki. Guntuwar gano wutar lantarki tana da ƙimar amsa sama da 75.3 A/W a cikin yanayin sarrafa kai, ƙimar ganowa na 7.5 × 10¹⁴ Jones, da ƙimar ƙima na waje kusa da 104%, haɓaka aikin gano nau'ikan kwakwalwan kwamfuta iri ɗaya ta hanyar rikodin umarni 7 na girma. Bugu da ƙari, a ƙarƙashin yanayin tuƙi na al'ada, ƙimar amsawar guntu, ƙimar ganowa, da ƙimar ƙididdigewa na waje duk sun kai 843 A/W, 10¹⁵ Jones, da 105% bi da bi, duk waɗannan sune mafi girman ƙimar da aka ruwaito a cikin bincike na yanzu. A halin yanzu, wannan binciken ya kuma nuna ainihin aikace-aikacen na'urar ganowa ta photoelectric a fagen sadarwa na gani da hoto na infrared, yana nuna babbar damar aikace-aikacensa.
Domin yin nazarin tsarin aikin photoelectric na mai binciken hoto bisa graphene nanoribbons /Al₂O₃/ silicon crystal silicon, masu bincike sun gwada tsayin daka (kwanjin wutar lantarki na yanzu) da halayen halayen halayen halayen (tsawon lokaci na yanzu). Don ƙididdige halayen amsawar gani na graphene nanoribbon / Al₂O₃/ monocrystalline silicon heterostructure photodetector a ƙarƙashin nau'ikan voltaji daban-daban, masu bincike sun auna amsawar na'urar a halin yanzu a 0 V, -1 V, -3 V da -5 V son rai, tare da ƙarancin ƙarfin gani na μW² 8.5cm. Hoton yanzu yana ƙaruwa tare da juyawa baya kuma yana nuna saurin amsawa a duk ƙarfin son zuciya.
A ƙarshe, masu binciken sun ƙirƙira tsarin ƙirar hoto kuma sun sami nasarar yin amfani da hoto mai sarrafa kansa na infrared gajere. Tsarin yana aiki a ƙarƙashin nuna son rai kuma ba shi da kuzari kwata-kwata. An kimanta ikon hoton hoto ta amfani da abin rufe fuska mai baƙar fata tare da ƙirar harafin "T" (kamar yadda aka nuna a hoto 1).
A ƙarshe, wannan binciken ya sami nasarar ƙirƙira na'urori masu sarrafa kansu bisa ga graphene nanoribbons kuma ya sami ƙimar amsawa mai girma. A halin yanzu, masu binciken sun sami nasarar nuna hanyoyin sadarwa na gani da kuma damar hoto na wannanmai daukar hoto mai saurin amsawa. Wannan nasarar binciken ba wai kawai yana ba da hanya mai amfani don haɓaka nanoribbons na graphene da na'urorin optoelectronic na tushen silicon ba, har ma yana nuna kyakkyawan aikin su azaman na'urar gano infrared na gajeriyar igiyar ruwa.
Lokacin aikawa: Afrilu-28-2025