Ubuchwepheshe obusha bei-silicon photodetector encane
Izakhiwo zokuthwebula izithombe zisetshenziselwa ukuthuthukisa ukumuncwa kokukhanya kokuncaneama-silicon photodetectors
Amasistimu ezithombe athola amandla ngokushesha ezinhlelweni eziningi ezivelayo, okuhlanganisa ukuxhumana kwamehlo, ukuzwa kwe-liDAR, nokuthwebula kwezokwelapha. Kodwa-ke, ukwamukelwa okwandile kwama-photonics ezixazululweni zobunjiniyela zesikhathi esizayo kuncike ezindlekweni zokukhiqizaama-photodetectors, okuyinto encike kakhulu ohlotsheni lwe-semiconductor esetshenziselwa leyo njongo.
Ngokwesiko, i-silicon (Si) bekuyi-semiconductor etholakala yonke indawo embonini ye-elekthronikhi, kangangokuthi izimboni eziningi sezikhulile ngokuzungezile lezi zinto. Ngeshwa, i-Si ine-coefficient yokumunca ukukhanya ebuthaka ku-spectrum eseduze ye-infrared (NIR) uma kuqhathaniswa namanye ama-semiconductors afana ne-gallium arsenide (GaAs). Ngenxa yalokhu, ama-GaA nama-alloys ahlobene ayachuma ezinhlelweni ze-photonic kodwa akuhambisani nezinqubo zendabuko ze-complementary metal-oxide semiconductor (CMOS) ezisetshenziswa ekukhiqizeni izinto eziningi zikagesi. Lokhu kwaholela ekwenyukeni okukhulu kwezindleko zabo zokukhiqiza.
Abacwaningi baye baklama indlela yokuthuthukisa kakhulu ukumuncwa okuseduze kwe-infrared ku-silicon, okungaholela ekwehlisweni kwezindleko kumadivayisi we-photonic asebenza kahle kakhulu, futhi ithimba labacwaningi be-UC Davis liphayona isu elisha lokuthuthukisa kakhulu ukumuncwa kokukhanya kumafilimu amancane e-silicon. Ephepheni labo lakamuva ku-Advanced Photonics Nexus, babonisa ngokokuqala ngqa ukuboniswa kokuhlolwa kwesithwebuli sesithombe esisekelwe ku-silicon esithwebula ukukhanya okuncane - kanye nezakhiwo ze-nano-surface, sifinyelela ukuthuthukiswa kokusebenza okungakaze kubonwe ngokuqhathaniswa nama-GaAs namanye ama-semiconductors eqembu le-III-V. . I-photodetector iqukethe ipuleti le-silicon eligqize nge-micron-cylindrical elibekwe phezu kwe-substrate evikelayo, "neminwe" yensimbi enwebeka ngendlela yemfoloko yomunwe kusuka ensimbi ethintwayo phezulu kwepuleti. Okubalulekile, i-silicon enezigaxa igcwele izimbobo eziyindilinga ezihlelwe ngephethini yezikhathi ezithile ezisebenza njengezindawo zokuthwebula izithombe. Isakhiwo sisonke sedivayisi sibangela ukukhanya kwesigameko okuvame ukugoba cishe ngo-90° lapho sishaya phezulu, okusivumela ukuthi sisakazeke eceleni kwendiza ye-Si. Lezi zindlela zokusabalalisa ezisemaceleni zandisa ubude bohambo lokukhanya futhi zibambezele ngokuphumelelayo, okuholela ekusebenzelaneni okwengeziwe kokukhanya futhi ngaleyo ndlela kukhule ukumuncwa.
Abacwaningi baphinde benza ukulingisa okubonakalayo kanye nokuhlaziywa kwethiyori ukuze baqonde kangcono imiphumela yezakhiwo zokuthwebula ama-photon, futhi benza izivivinyo ezimbalwa eziqhathanisa ama-photodetectors nazo nangaphandle kwazo. Bathole ukuthi ukuthwebula ama-photon kuholele ekuthuthukisweni okukhulu kokumuncwa kwe-broadband ku-spectrum ye-NIR, kuhlala ngaphezu kwama-68% nenani eliphakeme lama-86%. Kuyaphawuleka ukuthi kubhendi ye-infrared eseduze, i-coefficient yokumuncwa ye-photon capture photodetector iphakeme izikhathi eziningana kune-silicon evamile, idlula i-gallium arsenide. Ngaphezu kwalokho, nakuba idizayini ehlongozwayo ingeyamapuleti e-silicon awugqinsi angu-1μm, ukulingiswa kwamafilimu e-silicon angu-30 nm nayi-100 nm ahambisana ne-CMOS electronics abonisa ukusebenza okuthuthukisiwe okufanayo.
Sekukonke, imiphumela yalolu cwaningo ikhombisa isu elithembisayo lokuthuthukisa ukusebenza kwama-photodetectors asuselwa ku-silicon ezinhlelweni ezisafufusa zama-photonics. Ukumuncwa okuphezulu kungafinyelelwa ngisho nasezingqimbeni ze-silicon ezacile kakhulu, futhi amandla e-parasitic wesekethe angagcinwa aphansi, okubalulekile ezinhlelweni ezinesivinini esikhulu. Ngaphezu kwalokho, indlela ehlongozwayo iyahambisana nezinqubo zokukhiqiza ze-CMOS zesimanje ngakho-ke inamandla okuguqula indlela ama-optoelectronics ahlanganiswe ngayo kumasekethe endabuko. Lokhu, nakho, kungavula indlela yokweqa okukhulu kumanethiwekhi amakhompiyutha ashesha kakhulu kanye nobuchwepheshe bezithombe.
Isikhathi sokuthumela: Nov-12-2024