Ubuchwepheshe obusha be-silicon photodetector encane

Ubuchwepheshe obusha be-i-silicon photodetector encane
Izakhiwo zokubamba i-photon zisetshenziselwa ukuthuthukisa ukumuncwa kokukhanya ku-thinama-photodetector e-silicon
Izinhlelo ze-Photonic ziyashesha ukuthandwa ezinhlelweni eziningi ezintsha, okuhlanganisa ukuxhumana kwe-optical, ukuzwa kwe-liDAR, kanye nokuthwebula izithombe kwezokwelapha. Kodwa-ke, ukwamukelwa kabanzi kwe-photonics ezixazululweni zobunjiniyela zesikhathi esizayo kuncike ezindlekweni zokukhiqiza.ama-photodetectors, okuncike kakhulu ohlotsheni lwe-semiconductor olusetshenziswa ngaleyo njongo.
Ngokwesiko, i-silicon (Si) ibilokhu iyi-semiconductor etholakala kakhulu embonini yama-elekthronikhi, kangangokuthi izimboni eziningi sezikhule zizungeze le nto. Ngeshwa, i-Si ine-coefficient yokumuncwa kokukhanya ebuthakathaka kakhulu ku-spectrum ye-near infrared (NIR) uma kuqhathaniswa nezinye i-semiconductor ezifana ne-gallium arsenide (GaAs). Ngenxa yalokhu, ama-GaA kanye nama-alloy ahlobene nawo ayachuma ezinhlelweni ze-photonic kodwa awahambisani nezinqubo zendabuko ze-complementary metal-oxide semiconductor (CMOS) ezisetshenziswa ekukhiqizweni kwama-elekthronikhi amaningi. Lokhu kwaholela ekukhuleni okukhulu kwezindleko zawo zokukhiqiza.
Abacwaningi baklame indlela yokuthuthukisa kakhulu ukumuncwa kwe-silicon okuseduze ne-infrared, okungaholela ekunciphiseni izindleko kumadivayisi e-photonic asebenza kahle kakhulu, futhi ithimba locwaningo le-UC Davis liqala isu elisha lokuthuthukisa kakhulu ukumuncwa kokukhanya kumafilimu amancane e-silicon. Ephepheni labo lakamuva ku-Advanced Photonics Nexus, babonisa okokuqala ukubonakaliswa kokuhlola kwe-photodetector esekelwe ku-silicon enezakhiwo ezincane nezincane zokubamba ukukhanya, okufeza ukuthuthukiswa kokusebenza okungakaze kubonwe ngaphambili okufana ne-GaAs kanye nezinye i-semiconductors zeqembu le-III-V. I-photodetector inepuleti le-silicon eliyindilinga eliyindilinga elibekwe ku-substrate yokuvikela, "neminwe" yensimbi enwebeka ngendlela yefoloko lomunwe kusukela ensimbini yokuxhumana phezulu kwepuleti. Okubaluleke kakhulu, i-silicon enamaqhubu igcwele izimbobo eziyindilinga ezihlelwe ngephethini yezikhathi ezisebenza njengezindawo zokubamba i-photon. Isakhiwo sonke sedivayisi sibangela ukuthi ukukhanya okuvamile ukugoba cishe ngo-90° lapho kushaya indawo, okuvumela ukuthi kusakazeke eceleni kwendiza ye-Si. Lezi zindlela zokusabalalisa ohlangothini zandisa ubude bokuhamba kokukhanya futhi zinciphise ijubane ngempumelelo, okuholela ekusebenzisaneni okwengeziwe kwezinto zokukhanya futhi ngaleyo ndlela kwandise ukumuncwa.
Abacwaningi baphinde benza ukulingisa kokukhanya kanye nokuhlaziywa kwethiyori ukuze baqonde kangcono imiphumela yezakhiwo zokubamba i-photon, futhi benze izivivinyo eziningana beqhathanisa ama-photodetector anawo nangenawo. Bathole ukuthi ukubamba i-photon kuholele ekuthuthukisweni okukhulu ekusebenzeni kahle kokumuncwa kwe-broadband ku-spectrum ye-NIR, kuhlala ngaphezu kuka-68% ngenani eliphakeme elingu-86%. Kubalulekile ukuqaphela ukuthi ebhendini eliseduze le-infrared, i-absorption coefficient ye-photodetector yokubamba i-photon iphakeme kaningana kuneye-silicon evamile, idlula i-gallium arsenide. Ngaphezu kwalokho, yize umklamo ohlongozwayo ungowama-silicon plates angu-1μm obukhulu, ukulingisa kwamafilimu e-silicon angu-30 nm kanye no-100 nm ahambisana ne-CMOS electronics kubonisa ukusebenza okufanayo okuthuthukisiwe.
Sekukonke, imiphumela yalolu cwaningo ikhombisa isu elithembisayo lokuthuthukisa ukusebenza kwama-photodetector asekelwe ku-silicon ekusetshenzisweni kwe-photonics okusafufusa. Ukumuncwa okuphezulu kungatholakala ngisho nasezingqimbeni ze-silicon ezincane kakhulu, futhi amandla e-parasite wesekethe angagcinwa ephansi, okubaluleke kakhulu ezinhlelweni zesivinini esikhulu. Ngaphezu kwalokho, indlela ephakanyisiwe iyahambisana nezinqubo zokukhiqiza ze-CMOS zanamuhla futhi ngenxa yalokho inamandla okuguqula indlela ama-optoelectronics ahlanganiswa ngayo kumasekethe endabuko. Lokhu, nakho, kungavula indlela yentuthuko enkulu kumanethiwekhi ekhompyutha angabizi kakhulu kanye nobuchwepheshe bokuthwebula izithombe.