E itlhophisang ka bo eona ka ts'ebetso e phahamengsesebelisoa sa ho lemoha foto sa infrared
infraredsesebelisoa sa ho lemoha fotoe na le litšobotsi tsa bokhoni bo matla ba ho thibela tšitiso, bokhoni bo matla ba ho lemoha lipheo, ts'ebetso ea maemo ohle a leholimo le ho ipata hantle. E bapala karolo ea bohlokoa haholo masimong a kang bongaka, sesole, theknoloji ea sebaka le boenjiniere ba tikoloho. Har'a tsona, e itsamaisangho lemoha photoelectricchip e ka sebetsang ka boikemelo ntle le phepelo e eketsehileng ea motlakase e kantle e hohetse tlhokomelo e kholo lefapheng la ho lemoha infrared ka lebaka la ts'ebetso ea eona e ikhethang (joalo ka boikemelo ba matla, kutlo e phahameng le botsitso, jj.). Ka lehlakoreng le leng, li-chip tsa setso tsa ho lemoha photoelectric, tse kang li-chip tsa infrared tse thehiloeng ho silicon kapa narrowbandgap semiconductor tse thehiloeng ho tsona, ha li hloke feela li-voltage tse ling tsa bias ho khanna karohano ea li-carrier tse hlahisoang ke photo ho hlahisa li-photocurrents, empa hape li hloka litsamaiso tse ling tsa ho pholisa ho fokotsa lerata la mocheso le ho ntlafatsa karabelo. Ka hona, ho se ho le thata ho fihlela likhopolo le litlhoko tse ncha tsa moloko o latelang oa li-chip tsa ho lemoha infrared nakong e tlang, joalo ka tšebeliso e tlase ea matla, boholo bo bonyenyane, litšenyehelo tse tlase le ts'ebetso e phahameng.
Haufinyane tjena, lihlopha tsa lipatlisiso tse tsoang Chaena le Sweden li hlahisitse chip e ncha ea ho lemoha motlakase ea pin heterojunction e iketselitseng maqhubu a makhutšoanyane a infrared (SWIR) e thehiloeng lifiliming tsa graphene nanoribbon (GNR)/alumina/silicon e le 'ngoe ea kristale. Tlas'a phello e kopaneng ea phello ea optical gating e hlahisitsoeng ke sebopeho se fapaneng le tšimo ea motlakase e hahiloeng kahare, chip e bontšitse karabelo e phahameng haholo le ts'ebetso ea ho lemoha ka motlakase oa lefela. Chip ea ho lemoha motlakase e na le sekhahla sa karabelo sa A se phahameng ho fihlela ho 75.3 A/W mokhoeng o iketselitseng, sekhahla sa ho lemoha sa 7.5 × 10¹⁴ Jones, le katleho ea quantum ea kantle e haufi le 104%, e ntlafatsang ts'ebetso ea ho lemoha ea mofuta o tšoanang oa li-chip tse thehiloeng ho silicon ka li-odara tse 7 tsa boholo. Ho phaella moo, tlas'a mokhoa oa ho khanna o tloaelehileng, sekhahla sa karabelo sa chip, sekhahla sa ho lemoha, le katleho ea quantum ea kantle kaofela li phahame ho fihlela ho 843 A/W, 10¹⁵ Jones, le 105% ka ho latellana, tseo kaofela e leng boleng bo holimo bo tlalehiloeng lipatlisisong tsa hajoale. Ho sa le jwalo, phuputso ena e boetse e bontshitse tshebediso ya lefatshe la nnete ya chip ya ho lemoha photoelectric masimong a puisano ya optical le infrared imaging, e totobatsa bokgoni ba yona bo boholo ba tshebediso.
E le ho ithuta ka mokhoa o hlophisehileng tshebetso ya photoelectric ya photodetector e itshetlehileng hodima graphene nanoribbons /Al₂O₃/ single crystal silicon, bafuputsi ba lekile dikarabelo tsa yona tse sa fetoheng (current-voltage current) le dikarabelo tsa yona tse nang le matla (current-time current). Ho lekola ka mokhoa o hlophisehileng dibopeho tsa karabelo ya optical tsa graphene nanoribbon /Al₂O₃/ monocrystalline silicon heterostructure photodetector tlasa di-voltage tse fapaneng tsa bias, bafuputsi ba lekanyeditse karabelo ya dynamic current ya sesebediswa ho 0 V, -1 V, -3 V le -5 V biases, ka matla a optical a 8.15 μW/cm². Photocurrent e eketseha ka reverse bias mme e bontsha lebelo la karabelo le potlakileng ho di-voltage tsohle tsa bias.
Qetellong, bafuputsi ba ile ba qapa sistimi ea ho nka litšoantšo 'me ba atleha ho fihlela litšoantšo tse iketsang tsa infrared ea maqhubu a makhutšoanyane. Sistimi ena e sebetsa tlas'a leeme la lefela 'me ha e na tšebeliso ea matla ho hang. Bokhoni ba ho nka litšoantšo ba sesebelisoa sa ho lemoha litšoantšo bo ile ba hlahlojoa ho sebelisoa maske e ntšo e nang le paterone ea tlhaku "T" (joalokaha ho bontšitsoe ho Setšoantšo sa 1).
Qetellong, patlisiso ena e atlehile ho iketsetsa di-photodetector tse iketsang tse itshetlehileng hodima di-nanoribbon tsa graphene mme ya fihlella sekgahla se phahameng sa karabelo se robang rekoto. Ho sa le jwalo, bafuputsi ba atlehile ho bontsha bokgoni ba puisano le ho nka ditshwantsho ba senasesebelisoa sa ho lemoha lifoto se arabelang hantleKatleho ena ea lipatlisiso ha e fane feela ka mokhoa o sebetsang bakeng sa nts'etsopele ea li-nanoribbon tsa graphene le lisebelisoa tsa optoelectronic tse thehiloeng ho silicon, empa hape e bontša ts'ebetso ea tsona e ntle haholo e le li-photodetector tsa infrared tse iketsang ka botsona.
Nako ea poso: Mmesa-28-2025