Mohloli o tlase oa sekhahla sa infrared avalanche photodetector

Boemo bo tlase ba infraredAvalanche photodetector

Sesebelisoa sa lifoto tsa infrared avalanche (APD photodetector) ke sehlopha salisebelisoa tsa semiconductor photoelectrictse hlahisang phaello e phahameng ka phello ea ionization ea ho thulana, e le ho fihlela bokhoni ba ho lemoha ba photon tse fokolang kapa esita le photon e le 'ngoe. Leha ho le joalo, ka meaho e tloaelehileng ea APD photodetector, mokhoa oa ho hasanya o sa leka-lekaneng o lebisa ho lahleheloa ke matla, e le hore motlakase oa avalanche o hloka ho fihla ho 50-200 V. Sena se beha litlhoko tse phahameng holim'a mochine oa motlakase oa mochine le moralo oa potoloho ea ho bala, ho eketsa litšenyehelo le ho fokotsa lits'ebetso tse pharaletseng.

Haufinyane tjena, lipatlisiso tsa Machaena li hlahisitse sebopeho se secha sa avalanche haufi le sebui sa infrared se nang le voltage e tlase ea avalanche le kutlo e phahameng. Ho ipapisitsoe le "self-doping homojunction" ea lera la athomo, "avalanche photodetector" e rarolla ho hasana ho kotsi ho bakoang ke boemo ba bokooa bo ke keng ba qojoa ka heterojunction. Ho sa le joalo, sebaka se matla sa "tlhōrō" sa motlakase se susumetsoang ke ho senya symmetry breaking se sebelisetsoa ho ntlafatsa tšebelisano ea coulomb pakeng tsa bajari, ho hatella mokhoa oa phonon oa sefofaneng o laolang ho hasana, le ho finyella katleho e phahameng habeli ea bajari ba sa leka-lekaneng. Mocheso oa kamore, matla a monyako a haufi le moeli oa khopolo-taba Mohlala (Mohlala ke lekhalo la sehlopha sa semiconductor) 'me kutloisiso ea ho lemoha ha sebui sa infrared avalanche e fihla ho 10000 photon level.

Boithuto bona bo ipapisitse le atom-layer self-doped tungsten diselenide (WSe₂) homojunction (two-dimensional transition metal chalcogenide, TMD) e le mokhoa oa ho fumana chelete bakeng sa li-avalanche tse tsamaisang litefiso. Phetolelo ea symmetry ea sebaka e fihlelleha ka ho rala phetoho ea mohato oa topography ho kenya sebaka se matla sa "spike" sa motlakase ho interface ea mutant homojunction.

Ho phaella moo, botenya ba athomo bo ka hatella mochine oa ho hasanya o laoloang ke mokhoa oa phonon, 'me o lemohe mokhoa oa ho potlakisa le oa ho atisa ho se nang tekano ka tahlehelo e tlaase haholo. Sena se tlisa matla a avalanche mochesong oa kamore haufi le moeli oa theory, ke hore, semiconductor material bandgap Mohl. The avalanche threshold voltage e theohile ho tloha ho 50 V ho ea ho 1.6 V, e leng se ileng sa lumella bafuputsi ho sebelisa li-circuits tsa dijithale tse butsoitseng tse butsoitseng ho khanna sekhahla.photodetectorhammoho le li-diode tsa koloi le li-transistors. Boithuto bona bo hlokomela phetoho e sebetsang hantle le ts'ebeliso ea matla a se nang teka-tekano ka moralo oa phello e tlase ea phallo ea li-avalanche, e fanang ka pono e ncha bakeng sa nts'etsopele ea moloko o latelang oa thekenoloji e hlokolosi haholo, e tlase le ho fumana chelete e ngata haholo.