UPhando olutsha kwi-Low-dimensional Avalanche Photodetector
Ukufunyanwa kovakalelo oluphezulu lweefotoni ezimbalwa okanye itekhnoloji yeefoton enye ibambe amathuba abalulekileyo osetyenziso kwimimandla efana nembonakalo yokukhanya okuphantsi, ukuva okude kunye ne-telemetry, kunye nonxibelelwano lwequantum. Phakathi kwabo, i-avalanche photodetectors (APD) ibe yindlela ebalulekileyo kwinkalo yophando lwesixhobo se-optoelectronic ngenxa yobukhulu babo 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 lwezinto ezi-2-dimensional (2D) ze-van der Waals heterojunctions zibonisa amathemba abanzi ekuphuhliseni ukusebenza okuphezulu kwe-APDs. Abaphandi abavela eChina bakhethe i-bipolar-two-dimensional semiconductor material WSe₂ njengesixhobo se-photosensitive kwaye balungiselele ngononophelo i-Pt/WSe₂/Ni isakhiwo.APD Photodetectorngowona msebenzi uhambelanayo wokusombulula ingxaki yengxolo yendalo ye-APD.
Abaphandi bacebise ii-avalanche photodetectorngokusekwe kwisakhiwo sePt/WSe₂/Ni, ukuphumeza ukuchongwa okubuthathaka kakhulu kweempawu zokukhanya ezibuthathaka kakhulu kwinqanaba le-fW kwiqondo lobushushu begumbi. Bakhetha izinto ezimbini ze-semiconductor ye-WSe₂, eneempawu ezintle zombane, kwaye idibanise kunye ne-Pt kunye ne-Ni electrode izinto zokuphuhlisa 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, ivumela i-photodetector ukuba ifikelele ekubhaqweni kwesignali ebukhali kakhulu kwinqanaba lengxolo ephantsi kakhulu.
Olu phononongo lubonisa indima ebalulekileyo yobunjineli bemathiriyeli kunye nokwenza ngcono ujongano ekwandiseni ukusebenza kweii-photodetectors. Ngokuqulunqwa kobuchule be-electrode kunye nezixhobo ezimbini-dimensional, umphumo wokukhusela wabathwali abamnyama uphunyeziwe, ukunciphisa kakhulu ukuphazamiseka kwengxolo kunye nokuphucula ngakumbi ukufumanisa ukusebenza kakuhle. Ukusebenza kwesi sitshixo akubonakali nje kuphela kwiimpawu zayo ze-photoelectric, kodwa kunye nethemba elibanzi lesicelo. Ngothintelo lwayo olusebenzayo lwangoku obumnyama kwiqondo lobushushu begumbi kunye nokufunxwa ngokufanelekileyo kwabathwali befoto, le fotodetector ifaneleke ngakumbi ukuchongwa kwemiqondiso 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: Aug-27-2025