Bipolar two-dimensional avalanche photodetector

Bipolar tse peli-dimensionalAvalanche photodetector

Bipolar two-dimensional avalanche photodetector (APD photodetector) e fihlella lerata le tlase haholo le ho lemoha maikutlo a phahameng

Ho lemoha ha li-photon tse 'maloa kapa esita le photon e le' ngoe ho na le menyetla ea bohlokoa ea ts'ebeliso likarolong tse kang litšoantšo tse fokolang tsa leseli, remote sensing le telemetry, le puisano ea quantum. Har'a bona, mochine oa setšoantšo sa avalanche (APD) e fetohile tataiso ea bohlokoa lefapheng la lipatlisiso tsa lisebelisoa tsa optoelectronic ka lebaka la litšobotsi tsa eona tsa boholo bo nyane, bokhoni bo phahameng le ho kopanya habonolo. Letšoao-ho-noise ratio (SNR) ke pontšo ea bohlokoa ea APD photodetector, e hlokang phaello e phahameng le lefifi le tlaase hona joale. Patlisiso e mabapi le li-heterojunctions tsa van der Waals tsa thepa ea mahlakore a mabeli (2D) e bonts'a litebello tse pharaletseng ho nts'etsopele ea li-APD tsa ts'ebetso e phahameng. Bafuputsi ba tsoang Chaena ba khethile lisebelisoa tsa bipolar tse peli-dimensional semiconductor WSe₂ e le sesebelisoa sa lifoto 'me se lokiselitse ka hloko APD photodetector e nang le sebopeho sa Pt/WSe₂/Ni se nang le ts'ebetso e ts'oanang e ts'oanang hantle, e le ho rarolla bothata ba lerata ba tlhaho ba APD ea setso.

Sehlopha sa liphuputso se ile sa etsa tlhahiso ea hore ho be le mochine oa avalanche photodetector ho latela sebopeho sa Pt/WSe₂/Ni, se fihletseng tšibollo e hlokolosi ea mats'oao a khanya a fokolang haholo maemong a fW mocheso oa kamore. Ba khethile thepa ea semiconductor ea mahlakore a mabeli WSe₂, e nang le thepa e ntle ea motlakase, 'me e kopantsoe le lisebelisoa tsa Pt le Ni electrode ho atleha ho hlahisa mofuta o mocha oa photodetector ea avalanche. Ka ho ntlafatsa ka nepo ts'ebetso ea ts'ebetso e ts'oanang har'a Pt, WSe₂ le Ni, mochini oa lipalangoang o entsoe o ka thibelang bajari ba lefifi ka mokhoa o ikhethileng o lumella bajari ba lifoto hore ba fete. Mochine ona o fokotsa haholo lerata le feteletseng le bakoang ke ionization ea mokhanni, e leng se nolofalletsang photodetector ho finyella ho lemoha ha matšoao a mahlo a phahameng ka ho fetisisa ka lerata le tlaase haholo.

Joale, e le ho hlakisa mokhoa o ka morao oa phello ea avalanche e bakiloeng ke sebaka se fokolang sa motlakase, qalong bafuputsi ba ile ba lekola ho lumellana ha mesebetsi ea tlhaho ea litšepe tse fapaneng le WSe₂. Letoto la lisebelisoa tsa tšepe-semiconductor-metal (MSM) tse nang le li-electrode tse fapaneng tsa tšepe li ile tsa etsoa 'me ho ile ha etsoa liteko tse nepahetseng ho tsona. Ntle le moo, ka ho fokotsa ho hasana ha bajari pele ho qhoma ha avalanche e qala, ho ka fokotsoa ho ba teng ha ionization ea tšusumetso, ka hona ho fokotsa lerata. Ka hona, ho ile ha etsoa liteko tse loketseng. Ho tsoela pele ho bonts'a bophahamo ba Pt/WSe₂/Ni APD mabapi le litšobotsi tsa karabelo ea nako, bafuputsi ba ile ba tsoela pele ho lekola -3 dB bandwidth ea sesebelisoa tlas'a litekanyetso tse fapaneng tsa ho fumana motlakase oa lifoto.

Liphetho tsa liteko li bonts'a hore sesebelisoa sa Pt/WSe₂/Ni se bonts'a matla a lekanang le lerata a tlase haholo (NEP) mocheso oa kamore, e leng 8.07 fW/√Hz feela. Sena se bolela hore detector e khona ho tseba mats'oao a mahlo a fokolang haholo. Ho phaella moo, sesebelisoa sena se ka sebetsa ka mokhoa o tsitsitseng ka lebelo la ho feto-fetoha ha 20 kHz ka phaello e phahameng ea 5 × 10⁵, ka katleho ho rarolla bothata ba botekgeniki ba li-detectors tsa setso tsa photovoltaic tse thata ho leka-lekanya phaello e phahameng le bandwidth. Karolo ena e lebelletsoe ho e fa melemo e mengata lits'ebetsong tse hlokang phaello e phahameng le lerata le tlase.

Patlisiso ena e bonts'a karolo ea bohlokoa ea boenjineri ba lintho tse bonahalang le ho ntlafatsa sebopeho sa ho ntlafatsa ts'ebetso eali-photodetectors. Ka moralo o bohlale oa li-electrode le lisebelisoa tse mahlakore a mabeli, phello ea tšireletso ea bajari ba lefifi e fihletsoe, e fokotsa haholo tšitiso ea lerata le ho tsoela pele ho ntlafatsa ts'ebetso ea ho lemoha.

Ts'ebetso ea sesebelisoa sena ha e bonahale feela ka litšoaneleho tsa photoelectric, empa hape e na le tebello e pharaletseng ea ts'ebeliso. Ka mokhoa o atlehang oa ho thibela metsi a lefifi mocheso oa kamore le ho monya ka katleho ha li-carriers tsa photogenerated, mochine ona o loketse ka ho khetheha bakeng sa ho lemoha matšoao a fokolang a leseli libakeng tse kang ho hlahloba tikoloho, ho shebella linaleli le puisano ea optical. Katleho ena ea lipatlisiso ha e fane feela ka maikutlo a macha bakeng sa nts'etsopele ea li-photodetectors tsa thepa e tlaase, empa e boetse e fana ka litšupiso tse ncha bakeng sa lipatlisiso tsa nako e tlang le nts'etsopele ea lisebelisoa tsa optoelectronic tse sebetsang hantle le tse tlaase.