Ucwaningo Olusha Nge-Photodetector Ye-Avalanche Enobukhulu Obuphansi

Ucwaningo Olusha Nge-Photodetector Ye-Avalanche Enobukhulu Obuphansi

Ukutholwa kokuzwela okuphezulu kobuchwepheshe be-photon encane noma ngisho ne-single-photon kubamba amathuba amakhulu okusetshenziswa emikhakheni efana nokuthwebula izithombe ngokukhanya okuphansi, ukuzwa kude kanye ne-telemetry, kanye nokuxhumana kwe-quantum. Phakathi kwazo, ama-photodetector e-avalanche (APD) abe yisiqondiso esibalulekile emkhakheni wocwaningo lwedivayisi ye-optoelectronic ngenxa yobukhulu bawo obuncane, ukusebenza kahle okuphezulu kanye nokuhlanganiswa okulula. Isilinganiso sesignali-kuya-kumsindo (SNR) siyisibonakaliso esibalulekile se-APD Photodetector, esidinga inzuzo ephezulu kanye nogesi omnyama ophansi. Ucwaningo mayelana ne-van der Waals heterojunctions yezinto ezimbili (2D) lubonisa amathuba abanzi ekuthuthukisweni kwama-APD asebenza kahle kakhulu. Abacwaningi baseShayina bakhethe i-WSe₂ yezinto ezimbili ze-semiconductor ze-bipolar njengezinto ezizwela ukukhanya futhi balungiselela ngokucophelela isakhiwo se-Pt/WSe₂/Ni.I-APD Photodetectorngomsebenzi womsebenzi ohambisanayo ongcono kakhulu wokuxazulula inkinga yomsindo wenzuzo engokwemvelo ye-APD yendabuko.

Abacwaningi baphakamise ukuthiumshini wokuthola izithombe we-avalanchengokusekelwe esakhiweni se-Pt/WSe₂/Ni, bafinyelela ekutholakaleni okubucayi kakhulu kwezibonakaliso zokukhanya ezibuthakathaka kakhulu ezingeni le-fW ekushiseni kwegumbi. Bakhethe i-WSe₂ yezinto ze-semiconductor ezinezinhlangothi ezimbili, ezinezakhiwo zikagesi ezinhle kakhulu, futhi bazihlanganisa nezinto ze-Pt ne-Ni electrode ukuze bathuthukise ngempumelelo uhlobo olusha lwe-avalanche photodetector. Ngokwenza ngcono ngokunembile ukufana komsebenzi womsebenzi phakathi kwe-Pt, WSe₂ ne-Ni, kwaklanywa indlela yokuthutha engavimba ngempumelelo izindiza ezimnyama ngenkathi ivumela ngokukhethekile izindiza ezikhiqizwa nge-photo ukuba zidlule. Le ndlela yokunciphisa kakhulu umsindo owedlulele obangelwa yi-ionization yomthelela we-carrier, okwenza i-photodetector ikwazi ukuthola izibonakaliso ezibonakalayo ezibucayi kakhulu ezingeni lomsindo ophansi kakhulu.

Lolu cwaningo lubonisa indima ebalulekile yobunjiniyela bezinto zokwakha kanye nokwenza ngcono isikhombimsebenzisi ekuthuthukiseni ukusebenza kweama-photodetectors. Ngomklamo ohlakaniphile wama-electrode nezinto ezinezici ezimbili, umphumela wokuvikela wezinto ezithwala abamnyama ufinyelelwe, wanciphisa kakhulu ukuphazamiseka komsindo futhi wathuthukisa ukusebenza kahle kokuthola. Ukusebenza kwalesi sitholi akubonakali nje kuphela ezicini zaso ze-photoelectric, kodwa futhi kunamathuba amaningi okusebenzisa. Ngokuvimba kwaso okuphumelelayo kogesi omnyama ekushiseni kwegumbi kanye nokumuncwa okuphumelelayo kwezinto ezithwala izinto ezikhiqizwa nge-photo, lesi sitholi se-photodetector sifaneleka kakhulu ekutholeni izimpawu zokukhanya ezibuthakathaka emikhakheni efana nokuqapha imvelo, ukubuka izinkanyezi, kanye nokuxhumana kwe-optical. Le mpumelelo yocwaningo ayinikezi nje kuphela imibono emisha yokuthuthukiswa kwezinto ezithwala izinto ezinezici ezincane, kodwa futhi inikeza izinkomba ezintsha zocwaningo lwesikhathi esizayo kanye nokuthuthukiswa kwamadivayisi e-optoelectronic asebenza kahle kakhulu nangamandla aphansi.