Bipolar ebyiriifoto ya avalanche
Bipolar ebyiri-zifotora ya avalanche Photodetector (APD ifotora) igera ku rusaku ruke cyane no gutahura neza
Kumenyekanisha cyane-fotone nkeya cyangwa na fotone imwe ifite ibyifuzo byingenzi byo gukoresha mubice nko kwerekana urumuri rudakomeye, kumva kure na telemetrie, no gutumanaho kwa kwant. Muri byo, Photodetector ya avalanche (APD) yabaye icyerekezo cyingenzi mubijyanye nubushakashatsi bwibikoresho bya optoelectronic bitewe nibiranga ubunini buto, gukora neza no kwishyira hamwe byoroshye. Ikigereranyo cyerekana-urusaku (SNR) ni ikimenyetso cyingenzi cyerekana fotodetekeri ya APD, bisaba inyungu nyinshi hamwe n’umwijima muke. Ubushakashatsi kuri van der Waals butandukanye bwibikoresho (2D) byerekana ibyerekezo byinshi mugutezimbere APDs ikora cyane. Abashakashatsi baturutse mu Bushinwa bahisemo bipolar ibice bibiri bya semiconductor ibikoresho WSe₂ nk'ibikoresho bifotora kandi byateguwe neza na fotodetekeri ya APD ifite imiterere ya Pt / WSe₂ / Ni ifite ibikorwa byiza bihuye neza, kugirango bikemure ikibazo cy’inyungu cy’urusaku rwa gakondo ya APD ifotora.
Itsinda ry’ubushakashatsi ryasabye Photodetector ya avalanche ishingiye ku miterere ya Pt / WSe₂ / Ni, yageze ku buryo bworoshye bwo kumenya ibimenyetso by’urumuri bidakomeye cyane ku rwego rwa fW ku bushyuhe bw’icyumba. Bahisemo ibice bibiri-byifashishwa bya semiconductor WSe₂, ifite ibikoresho byiza byamashanyarazi, kandi bahuza ibikoresho bya electrode ya Pt na Ni kugirango batezimbere ubwoko bushya bwa Photodetector. Mugutezimbere neza imikorere yimirimo ihuye na Pt, WSe₂ na Ni, hashyizweho uburyo bwo gutwara abantu bushobora guhagarika neza abitwara umwijima mugihe bahisemo kwemerera abatwara amafoto banyuramo. Ubu buryo bugabanya cyane urusaku rwinshi ruterwa ningaruka zabatwara ionisiyoneri, bigafasha Photodetector kugera kubimenyetso byerekana ibimenyetso bya optique byoroshye kurwego rwurusaku ruke cyane.
Hanyuma, kugirango basobanure uburyo bwihishe inyuma yingaruka ziterwa na avalanche iterwa numuriro w'amashanyarazi udakomeye, abashakashatsi babanje gusuzuma guhuza ibikorwa byimirimo isanzwe yibyuma bitandukanye na WSe₂. Urukurikirane rw'ibyuma-semiconductor-icyuma (MSM) hamwe na electrode zitandukanye z'ibyuma byahimbwe kandi hakozwe ibizamini bijyanye. Byongeye kandi, mugabanye abatwara gutatanya mbere yuko inkangu itangira, impanuka ziterwa na ionisation zirashobora kugabanuka, bityo bikagabanya urusaku. Kubwibyo, ibizamini bifatika byakozwe. Kugirango turusheho kwerekana ubunararibonye bwa Pt / WSe₂ / Ni APD mubijyanye nibisubizo byigihe, abashakashatsi bakomeje gusuzuma umurongo wa -3 dB wumurongo wigikoresho munsi yinyungu zinyuranye zifotora.
Ibisubizo byubushakashatsi byerekana ko icyuma cya Pt / WSe₂ / Ni cyerekana urusaku ruke cyane ruhwanye (NEP) mubushyuhe bwicyumba, ni 8.07 fW / √Hz. Ibi bivuze ko detector ishobora kumenya ibimenyetso bya optique bidakomeye cyane. Byongeye kandi, iki gikoresho kirashobora gukora neza kuri modulisiyo ya 20 kHz hamwe ninyungu nyinshi za 5 × 10⁵, bikemura neza ikibazo cya tekiniki ya disikuru gakondo ya fotokoltaque bigoye kuringaniza inyungu nini nubunini. Iyi mikorere iteganijwe kuyiha ibyiza byingenzi mubisabwa bisaba inyungu nyinshi n urusaku ruke.
Ubu bushakashatsi bwerekana uruhare rukomeye rwubuhanga bwibikoresho hamwe nogutezimbere interineti mukuzamura imikorere yagufotora. Binyuze mu buhanga bwa electrode hamwe nibikoresho bibiri, ingaruka zo gukingira abatwara umwijima zaragezweho, bigabanya cyane urusaku rw urusaku no kurushaho kunoza imikorere.
Imikorere yiyi detector ntabwo igaragara gusa mubiranga ifoto yamashanyarazi, ariko kandi ifite ibyifuzo byinshi byo gusaba. Hamwe noguhagarika kwiza kwumwijima mubushyuhe bwicyumba no kwinjiza neza abatwara fotogène, iyi deteter irakwiriye cyane cyane kumenya ibimenyetso byumucyo bidakomeye mubice nko gukurikirana ibidukikije, kwitegereza inyenyeri, no gutumanaho neza. Ubu bushakashatsi bugezweho ntabwo butanga ibitekerezo bishya gusa mugutezimbere ibikoresho bifotora buke buke, ahubwo binatanga ibitekerezo bishya kubushakashatsi buzaza no guteza imbere imikorere-nini kandi ifite imbaraga nke za optoelectronic.
Igihe cyo kohereza: Jun-18-2025