Umkhawulo ophansi we-infrared avalanche photodetector

Umkhawulo ophansi we-infraredi-avalanche photodetector

I-infrared avalanche photodetector (I-APD photodetector) yikilasi leAmadivayisi we-semiconductor photoelectricezikhiqiza inzuzo ephezulu ngomphumela we-ionization wokungqubuzana, ukuze kuzuzwe ikhono lokubona lama-photon ambalwa noma ama-photon awodwa. Nokho, ezakhiweni ezivamile ze-photodetector ye-APD, inqubo yokusakazwa kwenkampani yenethiwekhi engalingani iholela ekulahlekelweni kwamandla, njengokuthi i-avalanche threshold voltage ngokuvamile idinga ukufinyelela ku-50-200 V. Lokhu kubeka izimfuno eziphakeme ku-voltage yedrayivu yedivayisi kanye nomklamo wesekethe yokufunda, ukwandisa izindleko kanye nokukhawulela izinhlelo zokusebenza ezibanzi.

Muva nje, ucwaningo lwaseShayina seluphakamise ukwakheka okusha kwe-avalanche eduze komtshina we-infrared one-avalanche threshold voltage ephansi kanye nokuzwela okuphezulu. Ngokusekelwe ku-self-doping homojunction yongqimba lwe-athomu, i-avalanche photodetector ixazulula ukuhlakazeka okuyingozi okudalwe isimo sokungasebenzi kahle kwesixhumi esibonakalayo esingenakugwenywa ekuhlanganeni kwe-avalanche. Ngaleso sikhathi, inkambu kagesi yasendaweni eqinile “ephakeme” edalwe ukuphulwa kokulinganisa kokuhumusha isetshenziselwa ukuthuthukisa ukusebenzisana kwe-coulomb phakathi kwezinkampani zenethiwekhi, ukucindezela imodi yephonon ephuma endizeni ebuswa ukusakazeka, kanye nokuzuza ukusebenza kahle okuphindwe kabili kwezithwali ezingalingani. Ezingeni lokushisa legumbi, amandla e-threshold aseduze nomkhawulo wethiyori Isb.

Lolu cwaningo lusekelwe ku-atom-layer self-doped tungsten diselenide (WSe₂) homojunction (i-two-dimensional transition metal chalcogenide, TMD) njengendlela yokuzuza yokushaja ama-avalanche enkampani yenethiwekhi. Ukwephulwa kwe-symmetry yokuhumusha yendawo kufinyelelwa ngokuklama ukuguqulwa kwesinyathelo se-topography ukuze kufakwe inkambu kagesi yasendaweni “ye-spike” kusixhumi esibonakalayo se-mutant homojunction.

Ngaphezu kwalokho, ukujiya kwe-athomu kungacindezela indlela yokuhlakazeka ebuswa imodi yephonon, futhi kubone inqubo yokusheshisa nokuphindaphinda yesiphathi esingalingani ngokulahleka okuphansi kakhulu. Lokhu kuletha i-avalanche threshold energy ezingeni lokushisa legumbi eduze nomkhawulo wethiyori okungukuthi ibhande le-semiconductor impahla Isib. I-avalanche threshold voltage yehlisiwe isuka ku-50 V yaya ku-1.6 V, okuvumela abacwaningi ukuthi basebenzise amasekhethi edijithali anamandla aphansi avuthiwe ukushayela i-avalanche.i-photodetectorkanye nama-diode okushayela kanye nama-transistors. Lolu cwaningo lubona ukuguqulwa okusebenzayo kanye nokusetshenziswa kwamandla okuthwala angalingani ngokuklanywa komphumela wokuphindaphinda kwe-avalanche ephansi, okunikeza umbono omusha wokuthuthukiswa kwesizukulwane esilandelayo sobuchwepheshe obuzwela kakhulu, obuphansi kanye nokuzuza okuphezulu kobuchwepheshe bokubona i-avalanche infrared.