Tsvagiridzo Itsva paAvalanche Photodetector ine mativi mashoma
Kuonekwa kwehunyanzvi hwepamusoro hwema "short-photon" kana "single-photon" matekinoroji ane mukana wakakura wekushandisa muminda yakaita se "low-light imaging", "remote sensing" uye "telemetry", pamwe ne "quantum communication". Pakati pawo, "avalanche photodetectors" (APD) dzave nzira yakakosha mumunda we "optoelectronic device research" nekuda kwehukuru hwadzo hudiki, kushanda zvakanaka uye nyore kubatanidzwa. Signal-to-noise ratio (SNR) chiratidzo chakakosha cheAPD Photodetector, iyo inoda "high gain" uye "low dark current". Tsvagiridzo pamusoro pe "two-dimensional" (2D) material van der Waals heterojunctions inoratidza mikana yakakura mukugadzirwa kwe "high-performance APDs". Vatsvagiri vekuChina vakasarudza "bipolar two-dimensional semiconductor material WSe₂" sechinhu chinonzwa "photosensitive" uye vakanyatsogadzira chimiro chePt/WSe₂/Ni.Chinoongorora Mufananidzo cheAPDnekushanda kwakanakisa kwekugadzirisa dambudziko reruzha rwekukwira kwemagetsi reAPD yechinyakare.
Vatsvagurudzi vakapa pfungwa yekutichinhu chinoona mafashamo emvurazvichibva pachimiro chePt/WSe₂/Ni, zvichiratidza kuti zviratidzo zvechiedza hazvina simba zvakanyanya pa fW level patembiricha yemumba zvinoonekwa zvakanyanya. Vakasarudza WSe₂ ine material maviri e semiconductor, ine hunhu hwakanaka hwemagetsi, uye vakaisanganisa nezvinhu zve Pt ne Ni electrode kuti vagadzire mhando itsva ye avalanche photodetector. Nekugadzirisa mashandiro ebasa pakati pePt, WSe₂ neNi, nzira yekufambisa yakagadzirwa inogona kudzivirira zvinobudirira vatakuri verima uku ichibvumira vatakuri ve photogenerated kuti vapfuure nepakati. Iyi nzira inoderedza zvakanyanya ruzha rwakawandisa rwunokonzerwa ne carrier impact ionization, zvichiita kuti photodetector iwane highly sensitive optical signal detection pa highly noise level.
Chidzidzo ichi chinoratidza basa rakakosha rekugadzira zvinhu uye kugadzirisa interface mukusimudzira mashandiro ephotodetectorsKuburikidza nekugadzirwa kweunyanzvi kwemaelectrode nezvinhu zvine mativi maviri, simba rekudzivirira rima rakawanikwa, zvichideredza zvakanyanya kupindira kweruzha uye kuwedzera kushanda zvakanaka kwekuona. Kushanda kweiyi detector hakungoratidzwi chete muhunhu hwayo hwe photoelectric, asiwo kune mikana yakawanda yekushandisa. Nekuvharira kwayo rima patembiricha yemumba uye kupinza kwayo zvakanaka kwevanotakura vanogadzira photo, iyi photodetector yakakodzera zvakanyanya kuona zviratidzo zvechiedza zvisina simba munzvimbo dzakadai sekutarisa zvakatipoteredza, kutarisa kwenyeredzi, uye kutaurirana kwemaziso. Kubudirira uku kwekutsvaga hakungopi mazano matsva ekugadzira ma photodetector ezvinhu zvine mativi mashoma, asiwo kunopa mareferensi matsva ekutsvagisa nekuvandudza mune ramangwana zvishandiso zve optoelectronic zvinoshanda zvakanyanya uye zvine simba shoma.
Nguva yekutumira: Nyamavhuvhu-27-2025