Uphando olutsha kwi-Low-dimensional Avalanche Photodetector

Uphando olutsha kwi-Low-dimensional Avalanche Photodetector

Ukuchonga ubuchwephesha be-photon ezimbalwa okanye i-single-photon ngendlela ebukhali kakhulu kunezinto ezibalulekileyo zokusetyenziswa kwiinkalo ezifana nemifanekiso ekhanyayo, ukubona kude kunye ne-telemetry, kunye nonxibelelwano lwe-quantum. Phakathi kwazo, ii-avalanche photodetectors (APD) ziye zaba yindlela ebalulekileyo kwicandelo lophando lwezixhobo ze-optoelectronic ngenxa yobukhulu bazo obuncinci, ukusebenza kakuhle kunye nokudibanisa okulula. Umlinganiselo weSignal-to-noise (SNR) luphawu olubalulekileyo lwe-APD Photodetector, efuna i-gain ephezulu kunye nomsinga omnyama ophantsi. Uphando kwi-two-dimensional (2D) material van der Waals heterojunctions lubonisa amathuba abanzi ekuphuhlisweni kwee-APDs eziphezulu zokusebenza. Abaphandi baseTshayina bakhethe i-bipolar two-dimensional semiconductor material WSe₂ njengezinto ezithatha i-photosensitive kwaye balungiselela ngononophelo isakhiwo se-Pt/WSe₂/Ni.Isixhobo sokubona ifoto se-APDkunye nomsebenzi ofanelekileyo wokufanisa ukusombulula ingxaki yengxolo yokufumana inzuzo ye-APD yendabuko.

Abaphandi bacebiseisixhobo sokubona ifoto se-avalanchengokusekelwe kwisakhiwo sePt/WSe₂/Ni, ukufikelela ekufumaneni imiqondiso yokukhanya ebuthathaka kakhulu kwinqanaba le-fW kubushushu begumbi. Bakhethe izinto ze-semiconductor ze-WSe₂ ezinemilinganiselo emibini, ezineempawu zombane ezibalaseleyo, baza bazidibanisa nezixhobo ze-electrode zePt kunye neNi ukuze baphuhlise ngempumelelo uhlobo olutsha lwe-avalanche photodetector. Ngokwenza ngcono ngokuchanekileyo ukufanisa umsebenzi phakathi kwePt, WSe₂ kunye neNi, kwayilwa indlela yokuthutha enokuthintela ngempumelelo i-dark carriers ngelixa ivumela ngokukhethekileyo i-photogenerated carriers ukuba idlule. Le ndlela yokuthutha inciphisa kakhulu ingxolo engaphezulu ebangelwa yi-carrier impact ionization, ivumela i-photodetector ukuba ifumane i-high sensitive optical signal detection kwinqanaba lengxolo ephantsi kakhulu.

Olu phononongo lubonisa indima ebalulekileyo yobunjineli bezixhobo kunye nokuphuculwa kojongano lonxibelelwano ekuphuculeni ukusebenza kweii-photodetectorsNgokusebenzisa uyilo olunobuchule lwee-electrode kunye nezinto ezinemilinganiselo emibini, isiphumo sokukhusela abathwali abamnyama sifezekisiwe, sanciphisa kakhulu ukuphazamiseka kwengxolo kwaye saphucula ngakumbi ukusebenza kakuhle kokufumanisa. Ukusebenza kwesi sitshicileli akubonakaliswa kuphela kwiimpawu zaso ze-photoelectric, kodwa sikwanazo namathuba amaninzi okusetyenziswa. Ngenxa yokuthintela kwayo ngempumelelo umbane omnyama kubushushu begumbi kunye nokufunxwa ngokufanelekileyo kwabathwali abaveliswe yi-photo, esi sitshicileli se-photo sifanelekile ngokukodwa ekufumaneni imiqondiso yokukhanya ebuthathaka kwiindawo ezifana nokubeka esweni okusingqongileyo, ukujonga iinkwenkwezi, kunye nonxibelelwano lwe-optical. Le mpumelelo yophando ayiboneleli nje kuphela ngeengcinga ezintsha zophuhliso lwe-photodetectors zezinto ezikumgangatho ophantsi, kodwa ikwabonelela ngeereferensi ezintsha zophando lwexesha elizayo kunye nophuhliso lwezixhobo ze-optoelectronic ezisebenzayo nezinamandla aphantsi.