Bipolar ine mativi mavirichinhu chinoona mafashamo emvura
Chinoongorora mafashamo emhepo chinonzi bipolar two-dimensional avalanche photodetector (Chinoongorora mufananidzo cheAPD) inoita ruzha rwakaderera zvakanyanya uye kuona kuti munhu anonzwa sei zvakanyanya
Kuonekwa kwemaphoton mashoma kana kunyange maphoton rimwe chete nenzira yekunzwa kwakanyanya kune mikana yakakosha yekushandisa munzvimbo dzakadai sekutora mifananidzo yechiedza chisina simba, kuona kure uye telemetry, uye kutaurirana kwequantum. Pakati pazvo, avalanche photodetector (APD) yave nzira yakakosha mumunda wekutsvaga kwemidziyo ye optoelectronic nekuda kwehunhu hwayo hwehukuru hudiki, kushanda zvakanaka uye nyore kubatanidzwa. Chiyero chesignal-to-noise (SNR) chiratidzo chakakosha cheAPD photodetector, iyo inoda gain yakakwira uye low dark current. Tsvagiridzo pamusoro pevan der Waals heterojunctions yezvinhu zve two-dimensional (2D) inoratidza mikana yakakura mukugadzirwa kwe high-performance APDs. Vatsvaguriri vanobva kuChina vakasarudza bipolar two-dimensional semiconductor material WSe₂ sechinhu chinonzwa chiedza uye APD photodetector yakagadzirwa zvakanaka ine Pt/WSe₂/Ni structure ine basa rakanakisisa rekufananidza, kuitira kugadzirisa dambudziko re gain noise re APD photodetector yechinyakare.
Chikwata chekutsvagisa chakapa zano rekushandisa avalanche photodetector yakavakirwa paPt/WSe₂/Ni structure, iyo yakaita kuti zviratidzo zvechiedza zvisina simba zvionekwe zviri nyore pa fW level patembiricha yemumba. Vakasarudza two-dimensional semiconductor material WSe₂, ine hunhu hwakanaka hwemagetsi, uye vakabatanidza zvinhu zve Pt ne Ni electrode kuti vagadzire mhando itsva ye avalanche photodetector. Nekugadzirisa mashandisirwo 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 rwakanyanya rwunokonzerwa ne carrier impact ionization, zvichiita kuti photodetector ikwanise kuona zviratidzo zve optical zviri nyore padanho reruzha rakaderera zvikuru.
Zvadaro, kuti vajekese mashandiro ari shure kwemhedzisiro yeavalanche inokonzerwa nesimba remagetsi risina simba, vaongorori vakatanga vaongorora kuenderana kwebasa resimbi dzakasiyana-siyana neWSe₂. Zvishandiso zvesimbi-semiconductor-metal (MSM) zvine maelectrode akasiyana esimbi zvakagadzirwa uye bvunzo dzakakodzera dzakaitwa pazviri. Pamusoro pezvo, nekuderedza kupararira kwecarrier avalanche isati yatanga, kurongeka kwe impact ionization kunogona kuderedzwa, nokudaro kuderedza ruzha. Naizvozvo, bvunzo dzakakodzera dzakaitwa. Kuti varatidze zvakare kunaka kwePt/WSe₂/Ni APD maererano nehunhu hwemhinduro yenguva, vaongorori vakaongorora zvakare -3 dB bandwidth yemudziyo pasi pemhando dzakasiyana dze photoelectric gain.
Mhedzisiro yekuedza inoratidza kuti chinoona nezvePt/WSe₂/Ni chinoratidza simba rakaenzana neruzha rakaderera zvikuru (NEP) patembiricha yemumba, iro riri 8.07 fW/√Hz chete. Izvi zvinoreva kuti chinoona nezveruzha chinogona kuona zviratidzo zvemaziso zvisina simba zvakanyanya. Pamusoro pezvo, mudziyo uyu unogona kushanda zvakadzikama pa20 kHz ine gain yakakwira ye5×10⁵, zvichibudirira kugadzirisa dambudziko rehunyanzvi rezvinoona zve photovoltaic zvechinyakare zvakaoma kuyera gain yakakwira uye bandwidth. Chinhu ichi chinotarisirwa kuchipa mabhenefiti akakosha mumashandisirwo anoda gain yakakwira uye ruzha rwakaderera.
Tsvagiridzo iyi inoratidza basa rakakosha rekugadzira zvinhu uye kugadzirisa interface mukusimudzira mashandiro ephotodetectorsKuburikidza nekugadzirwa kweunyanzvi kwemaerekitirodhi nezvinhu zvine mativi maviri, mhedzisiro yekudzivirira kwevanotakura rima yakawanikwa, zvichideredza zvakanyanya kupindira kweruzha uye zvichiwedzera kuvandudza mashandiro ekuona.
Kushanda kwechinhu ichi chinoona nezvemagetsi hakungoratidzwi chete muhunhu hwemagetsi, asiwo kune mikana yakawanda yekushandisa. Nekuvharira kwayo simba rerima patembiricha yemumba uye kupinza zvakanaka zvinhu zvinogadzirwa nemagetsi, chinhu ichi chinoona nezvemagetsi chakakodzera zvakanyanya kuona zviratidzo zvechiedza zvisina simba munzvimbo dzakadai sekutarisa zvakatipoteredza, kuongorora nyeredzi, uye kutaurirana kwemaziso. Kubudirira uku kwekutsvaga hakungopi mazano matsva ekugadzira zvinhu zvinoona nezvemagetsi zvine mativi mashoma, asiwo kunopa mareferensi matsva ekutsvagisa nekugadzira zvishandiso zvemagetsi zvine simba rakawanda uye zvine simba shoma.
Nguva yekutumira: Chikumi-18-2025