Ibipolar inamacala amabinii-avalanche photodetector
I-bipolar-dimensional two-dimensional avalanche photodetector (Isixhobo sokufota seAPD) ifezekisa ingxolo ephantsi kakhulu kunye nobhaqo oluphezulu lovakalelo
Ukufunyanwa kovakalelo oluphezulu lweefotoni ezimbalwa okanye neefotoni enye kunemibono ebalulekileyo yosetyenziso kwimimandla enje ngomfanekiso obuthathaka wokukhanya, ukuva okude kunye ne-telemetry, kunye nonxibelelwano lomyinge. Phakathi kwabo, i-avalanche photodetector (APD) ibe ngulwalathiso olubalulekileyo kwintsimi yophando lwesixhobo se-optoelectronic ngenxa yeempawu zayo zobukhulu obuncinci, ukusebenza okuphezulu kunye nokudibanisa okulula. Umlinganiselo we-signal-to-noise ratio (SNR) luphawu olubalulekileyo lwe-APD photodetector, efuna inzuzo ephezulu kunye nobumnyama obuphantsi. Uphando kwi-van der Waals heterojunctions ye-two-dimensional (2D) imathiriyeli ibonisa amathemba abanzi ekuphuhliseni ukusebenza okuphezulu kwe-APDs. Abaphandi abavela e-China bakhethe i-bipolar-dimensional semiconductor material WSe₂ njengesixhobo se-photosensitive kunye nokulungiswa ngokucokisekileyo kwe-APD photodetector nge-Pt/WSe₂/Ni isakhiwo esinowona msebenzi uhambelanayo womsebenzi, ukuze kusonjululwe ingxaki yengxolo yendalo ye-APD.
Iqela lophando licebise i-avalanche photodetector esekwe kwi-Pt/WSe₂/Ni isakhiwo, esiphumeze ukuchongwa okubuthathaka kakhulu kweempawu zokukhanya ezibuthathaka kakhulu kwinqanaba le-fW kwiqondo lobushushu begumbi. Bakhetha izinto ezimbini ze-semiconductor ye-WSe₂, eneempawu ezintle zombane, kunye nezixhobo ezidibeneyo ze-Pt kunye ne-Ni electrode ukuphuhlisa ngempumelelo uhlobo olutsha lwe-avalanche photodetector. Ngokulungiselela ngokuchanekileyo umsebenzi wokuthelekisa phakathi kwe-Pt, i-WSe₂ kunye ne-Ni, indlela yothutho yayilwa enokuthintela ngokufanelekileyo abathwali abamnyama ngelixa ngokukhethayo ivumela abathwali beefoto ukuba badlule. Lo matshini unciphisa kakhulu ingxolo egqithisileyo ebangelwa yimpembelelo ye-ionization yomthwali, eyenza ukuba i-photodetector ifikelele ekubhaqweni kwesignali ebukhali kakhulu kwinqanaba lengxolo ephantsi kakhulu.
Emva koko, ukuze kucaciswe indlela esemva kwempembelelo ye-avalanche ebangelwe yintsimi yombane ebuthathaka, abaphandi baqale bavavanya ukuhambelana kwemisebenzi yendalo yeentsimbi ezahlukeneyo kunye ne-WSe₂. Uluhlu lwezixhobo ze-metal-semiconductor-metal (MSM) ezinee-electrode zetsimbi ezahlukeneyo zenziwa kwaye iimvavanyo ezifanelekileyo zenziwa kuzo. Ukongeza, ngokunciphisa ukusasazwa komthwali ngaphambi kokuba i-avalanche iqale, ukungakhethi kwe-ionization yempembelelo kunokuncitshiswa, ngaloo ndlela kuncitshiswe ingxolo. Ngoko ke, iimvavanyo ezifanelekileyo zenziwa. Ukubonisa ngakumbi ukuphakama kwe-Pt/WSe₂/Ni APD ngokweempawu zokuphendula ixesha, abaphandi baphinda bavavanya i--3 dB bandwidth yesixhobo phantsi kwamaxabiso ahlukeneyo okufumana umbane.
Iziphumo zovavanyo zibonisa ukuba i-Pt/WSe₂/Ni detector ibonisa ingxolo ephantsi kakhulu elingana namandla (NEP) kwiqondo lobushushu legumbi, eliyi-8.07 fW/√Hz kuphela. Oku kuthetha ukuba isixhobo siyakwazi ukuchonga imiqondiso yamehlo ebuthathaka kakhulu. Ukongezelela, esi sixhobo sinokusebenza ngokuzinzileyo kwi-modulation frequency ye-20 kHz kunye nenzuzo ephezulu ye-5 × 10⁵, ukusombulula ngempumelelo ibhotile yezobugcisa be-photovoltaic detectors zendabuko ezinzima ukulinganisa inzuzo ephezulu kunye ne-bandwidth. Olu phawu kulindeleke ukuba lubonelele ngezibonelelo ezibalulekileyo kwizicelo ezifuna inzuzo ephezulu kunye nengxolo ephantsi.
Olu phando lubonisa indima ebalulekileyo yobunjineli bezinto eziphathekayo kunye nokulungelelaniswa kojongano ekwandiseni ukusebenza kweii-photodetectors. Ngoyilo olunobuchule lwee-electrode kunye nezixhobo ezimacala amabini, umphumo wokukhusela wabathwali abamnyama uphunyeziwe, ukunciphisa kakhulu ukuphazamiseka kwengxolo kunye nokuphucula ngakumbi ukuphumelela kokubona.
Ukusebenza kwesi sitshixo akubonakali nje kuphela kwiimpawu ze-photoelectric, kodwa kunethuba elibanzi lokusetyenziswa. Ngokuthintelwa kwayo okusebenzayo kobumnyama obukhoyo kwiqondo lobushushu begumbi kunye nokufunxwa ngokufanelekileyo kwabathwali bezithombe, le detector ifaneleke ngakumbi ukufumanisa imiqondiso yokukhanya ebuthathaka kwimimandla efana nokubeka iliso kokusingqongileyo, ukubonwa kweenkwenkwezi, kunye nonxibelelwano lwamehlo. Le mpumelelo yophando ayiboneleli nje kuphela ngeembono ezintsha zophuhliso lwezixhobo ze-photodetectors ezisezantsi-dimensional, kodwa ikwabonelela ngezalathiso ezintsha zophando lwexesha elizayo kunye nophuhliso lwezixhobo zokusebenza eziphezulu kunye ne-low-power optoelectronic.
Ixesha lokuposa: Jun-18-2025