Bafuputsi ba Moscow Institute of Physics and Technology ba khonne ho holisa lifilimi tse tšesaane tsa molybdenum disulfide tse fihlang ho lisekoere-mithara tse mashome a 'maloa. Ho ile ha bontšoa hore sebopeho sa thepa se ka fetoloa ka ho fetola mocheso oa motsoako. Lifilimi, tse bohlokoa ho elektronike le optoelectronics, li ile tsa fumanoa ka 900-1,000 ° Celsius. Liphuputso li ile tsa hatisoa koranteng ea ACS Applied Nano Materials.

Lisebelisoa tse nang le mahlakore a mabeli li hohela thahasello e kholo ka lebaka la thepa ea tsona e ikhethang e bakoang ke sebopeho sa tsona le lithibelo tsa mochini oa quantum. Lelapa la lisebelisoa tsa 2-D le kenyelletsa tšepe, li-semimetals, li-semiconductors le li-insulators. Graphene, eo mohlomong e leng eona ntho e tsebahalang haholo ea 2-D, ke lesela le le leng la liathomo tsa khabone. E na le litsamaiso tse phahameng ka ho fetisisa tse rekotiloeng ho fihlela joale. Leha ho le joalo, graphene ha e na lekhalo la sehlopha tlas'a maemo a tloaelehileng, 'me seo se fokotsa lits'ebetso tsa eona.

Ho fapana le graphene, bophara bo nepahetseng ba bandgap ho molybdenum disulfide (MoS2) bo etsa hore e loketse ho sebelisoa lisebelisoa tsa elektroniki. Lera le leng le le leng la MoS2 le na le sebopeho sa sandwich, le lera la molybdenum le petelitsoeng lipakeng tsa likarolo tse peli tsa liathomo tsa sebabole. Li-heterostructures tsa li-dimensional tse peli tsa van der Waals, tse kopanyang lisebelisoa tse fapaneng tsa 2-D, le tsona li bontša tšepiso e kholo. Ha e le hantle, li se li ntse li sebelisoa haholo lits'ebetsong tse amanang le matla le catalysis. Wafer-scale (sebaka se seholo) sa 2-D molybdenum disulfide e bonts'a monyetla oa tsoelo-pele ea ho theha lisebelisoa tsa elektronike tse bonaletsang le tse tenyetsehang, puisano ea optical bakeng sa likhomphutha tsa moloko o latelang, hammoho le mafapheng a mang a elektroniki le optoelectronics.

"Mokhoa oo re tlileng le oona oa ho kopanya MoS2 o kenyelletsa mehato e 'meli. Taba ea pele, filimi ea MoO3 e holisoa ho sebelisoa mokhoa oa ho beha lera la athomo, o fanang ka botenya bo nepahetseng ba lera la athomo mme o lumella ho koaheloa ka mokhoa o ts'oanang ha libaka tsohle. 'Me MoO3 e ka fumanoa habonolo ka li-wafers tsa bophara ba limilimithara tse 300. Ka mor'a moo, filimi e tšeloa mocheso ka mouoane oa sebabole. Ka lebaka leo, liathomo tsa oksijene tse ho MoO3 li nkeloa sebaka ke liathomo tsa sebabole, 'me MoS2 ea thehoa. Re se re ithutile ho holisa lifilimi tse tšesaane tsa MoS2 sebakeng se fihlang ho lisekoere-sentimithara tse mashome a 'maloa," ho hlalosa Andrey Markeev, hlooho ea MIPT's Atomic Layer Deposition Lab.

Bafuputsi ba ile ba etsa qeto ea hore sebopeho sa filimi se itšetlehile ka mocheso oa sulfurization. Lifilimi tse silafalitsoeng ka 500 ° С li na le lijo-thollo tsa kristale, li-nanometer tse seng kae, tse kentsoeng ka har'a matrix a amorphous. Ka 700 ° С, likristale tsena li ka ba 10-20 nm ka bophara 'me likarolo tsa S-Mo-S li lebisitsoe holimo holimo. Ka lebaka leo, bokaholimo bo na le litlamo tse ngata tse leketlileng. Sebopeho se joalo se bonts'a ts'ebetso e phahameng ea matla liketsong tse ngata, ho kenyelletsa le karabelo ea hydrogen evolution. E le hore MoS2 e sebelisoe lisebelisoa tsa elektronike, likarolo tsa S-Mo-S li tlameha ho bapisa holimo, tse fihletsoeng ka mocheso oa sulfurization oa 900-1,000 ° С. Lifilimi tse hlahisoang ke tse tšesaane joalo ka 1.3 nm, kapa likarolo tse peli tsa limolek'hule, 'me li na le sebaka sa bohlokoa sa khoebo (ke hore, se seholo ka ho lekaneng).

Lifilimi tsa MoS2 tse entsoeng ka tlas'a maemo a nepahetseng li ile tsa kenngoa meahong ea prototype ea tšepe-dielectric-semiconductor, e thehiloeng holim'a ferroelectric hafnium oxide le mohlala oa transistor e sebetsang tšimong. Filimi ea MoS2 meahong ena e sebelitse joalo ka kanale ea semiconductor. Tsamaiso ea eona e ne e laoloa ka ho fetola tataiso ea polarization ea lera la ferroelectric. Ha e kopana le MoS2, thepa ea La:(HfO2-ZrO2), e neng e entsoe pele ho laboratoring ea MIPT, e ile ea fumanoa e na le polarization e ka bang 18 microcoulombs per square centimeter. Ka mamello e feto-fetohang ea lipotoloho tse limilione tse 5, e ile ea phahamisa rekoto e fetileng ea lefats'e ea li-cycle tse 100,000 bakeng sa liteishene tsa silicon.