Ucwaningo Olusha Nge-Low-dimensional Avalanche Photodetector
Ukutholwa kokuzwela okuphezulu kwama-photon ambalwa noma ubuchwepheshe be-photon eyodwa kubambe amathemba abalulekile ohlelo lokusebenza emikhakheni efana ne-imaging yokukhanya okuphansi, inzwa eyirimothi ne-telemetry, kanye nokuxhumana kwe-quantum. Phakathi kwazo, ama-avalanche photodetectors (APD) abe isiqondiso esibalulekile emkhakheni wocwaningo lwedivayisi ye-optoelectronic ngenxa yobukhulu bawo obuncane, ukusebenza kahle okuphezulu nokuhlanganiswa okulula. Isilinganiso se-Signal-to-noise (SNR) iyinkomba ebalulekile ye-APD Photodetector, edinga inzuzo ephezulu kanye nobumnyama obuphansi bamanje. Ucwaningo lwezinto ezikabili-ntathu (2D) ze-van der Waals heterojunctions lubonisa amathuba abanzi ekuthuthukisweni kwama-APD asebenza kahle kakhulu. Abacwaningi abavela e-China bakhethe i-bipolar semiconductor material enezinhlangothi ezimbili i-WSe₂ njengento ethatha izithombe futhi balungisa ngokucophelela isakhiwo se-Pt/WSe₂/Ni.I-APD Photodetectorngomsebenzi omuhle kakhulu wokufanisa ukuxazulula inkinga yomsindo we-APD yendabuko.
Abacwaningi baye bahlongoza ii-avalanche photodetectorngokusekelwe kusakhiwo se-Pt/WSe₂/Ni, kufinyelelwa ukutholwa okuzwela kakhulu kwamasignali okukhanya abuthaka ngokwedlulele ezingeni le-fW kuzinga lokushisa legumbi. Bakhethe impahla ye-semiconductor enezinhlangothi ezimbili i-WSe₂, enezakhiwo zikagesi ezinhle kakhulu, futhi bayihlanganisa nezinto ze-Pt kanye ne-Ni electrode ukuze kuthuthukiswe ngempumelelo uhlobo olusha lwe-avalanche photodetector. Ngokwenza kahle umsebenzi wokufanisa phakathi kwe-Pt, WSe₂ kanye ne-Ni, kwaklanywa indlela yokuthutha engavimba ngempumelelo abathwali abamnyama kuyilapho ngokukhetha ivumela abathwali abakhiqizwe izithombe ukuthi badlule. Le nqubo inciphisa ngokuphawulekayo umsindo owedlulele obangelwa i-ionization yomthelela wenkampani yenethiwekhi, ivumela isitholi sesithombe ukuthi sifinyelele ukutholwa kwesignali yokubona ebucayi kakhulu ezingeni lomsindo eliphansi kakhulu.
Lolu cwaningo lubonisa indima ebalulekile yobunjiniyela bezinto zokwakha kanye nokwenza kahle isixhumi esibonakalayo ekuthuthukiseni ukusebenza kweama-photodetectors. Ngokuklama okuhlakaniphile kwama-electrode nezinto ezinezinhlangothi ezimbili, umphumela wokuvikela wabathwali abamnyama wafinyelelwa, kunciphisa kakhulu ukuphazamiseka komsindo nokuthuthukisa ngokwengeziwe ukusebenza kahle kokutholwa. Ukusebenza kwalo mtshina akubonakali nje kuphela ezicini zayo ze-photoelectric, kodwa futhi kunamathemba abanzi okusebenza. Ngokuvinjwa kwaso okusebenzayo kwamandla amnyama kuzinga lokushisa legumbi kanye nokumuncwa okuphumelelayo kwezinkampani zenethiwekhi ezikhiqizwe izithombe, lesi sithwebuli sesithombe sifaneleka ngokukhethekile ukutholwa kwamasignali okukhanya abuthaka emikhakheni efana nokuqapha indawo ezungezile, ukubhekwa kwezinkanyezi, nokuxhumana nokubona. Le mpumelelo yocwaningo ayihlinzeki ngemibono emisha kuphela yokuthuthukiswa kwezithonjana zezinto ezibonakalayo ezinobukhulu obuphansi, kodwa futhi inikeza izinkomba ezintsha zocwaningo lwesikhathi esizayo nokuthuthukiswa kwamadivayisi asebenza kahle kakhulu kanye namandla aphansi we-optoelectronic.
Isikhathi sokuthumela: Aug-27-2025