Vatsvagiri kubva kuMoscow Institute of Physics and Technology vakakwanisa kukura maatomu matete mafirimu e molybdenum disulfide anosvika makumi akati wandei emasentimita sikweya. Zvakaratidzwa kuti chimiro chechinhu chinogona kugadziridzwa nekusiyanisa tembiricha ye synthesis. Mafirimu, ayo anokosha kumagetsi uye optoelectronics, akawanikwa pa900-1,000 ° Celsius. Zvakawanikwa zvakaburitswa mumagazini ACS Applied Nano Materials.

Zviviri-dimensional zvinhu zviri kukwezva kufarira kwakawanda nekuda kwezvimiro zvavo zvakasarudzika zvinobva muchimiro chavo uye quantum mechanical zvirambidzo. Mhuri ye2-D zvinhu zvinosanganisira simbi, semimetals, semiconductors, uye insulators. Graphene, ingangove inonyanya kuzivikanwa 2-D zvinhu, imonolayer yemaatomu ecarbon. Iyo ine yakanyanya kubhadharisa-mutakuri kufamba kwakanyorwa kusvika nhasi. Nekudaro, graphene haina bhendi gap pasi pemamiriro akajairwa, uye izvo zvinomisa mashandisirwo ayo.

Kusiyana negraphene, iyo yakakwana hupamhi hwebhendi mu molybdenum disulfide (MoS2) inoita kuti ive yakakodzera kushandiswa mumidziyo yemagetsi. Imwe neimwe MoS2 layer ine sangweji chimiro, ine layer yemolybdenum yakasvinwa pakati pezvikamu zviviri zvemaatomu esarufa. Maviri-dimensional van der Waals heterostructures, ayo anosanganisa akasiyana 2-D zvinhu, anoratidza vimbiso huru zvakare. Muchokwadi, ivo vatove vakanyanya kushandiswa mune zvine chekuita nesimba zvikumbiro uye catalysis. Wafer-scale (hombe-nzvimbo) synthesis ye2-D molybdenum disulfide inoratidza mukana wekufambira mberi mukusikwa kwemidziyo yemagetsi inoonekera uye inochinjika, kutaurirana kwemaziso kumakomputa echizvarwa chinotevera, pamwe chete nedzimwe nzvimbo dzemagetsi uye optoelectronics.

"Nzira yatakauya nayo yekubatanidza MoS2 inosanganisira matanho maviri. Chekutanga, firimu reMoO3 rinokura richishandiswa tekinoroji yeatomic layer deposition, iyo inopa ukobvu hweatomu chaiyo uye inobvumira kuvharika kwenzvimbo dzese. Uye MoO3 inogona kuwanikwa zviri nyore pamawafers anosvika mazana matatu emamirimita muhupamhi. Zvadaro, iyo firimu inopisa-yakagadziriswa mumhepo yesarufa. Nekuda kweizvozvo, maatomu eokisijeni ari muMoO3 anotsiviwa nemaatomu esarufa, uye MoS2 inoumbwa. Isu takatodzidza kukura maatomu matete eMoS2 mafirimu munzvimbo inosvika makumi akati wandei emativi masendimita,” anotsanangura kudaro Andrey Markeev, mukuru weMIPT's Atomic Layer Deposition Lab.

Vatsvakurudzi vakasarudza kuti chimiro chemufirimu chinoenderana nekupisa kwesulfurization. Mafirimu ane sulfuri pa 500 ° С ane zviyo zvekristalline, mashoma nanometers imwe neimwe, akaiswa mune amorphous matrix. Pa700 ° С, makristallite aya anenge 10-20 nm mhiri uye S-Mo-S akaturikidzana akatariswa perpendicular kumusoro. Nekuda kweizvozvo, kumusoro kune zvakawanda zvinorembera zvisungo. Chimiro chakadaro chinoratidza chiitiko chepamusoro mukuita kwakawanda, kusanganisira iyo hydrogen evolution reaction. Kuti MoS2 ishandiswe mumagetsi, iwo maS-Mo-S akaturikidzana anofanirwa kuenderana nepamusoro, iyo inowanikwa pakudziya kwesarufa ye900-1,000 ° С. Mafirimu anozobuda akatetepa se1.3 nm, kana maviri mamolecular layers, uye ane nzvimbo yekutengeserana yakakosha (kureva, yakakura zvakakwana).

Mafirimu eMoS2 akagadzirwa pasi pemamiriro akakwana akaunzwa musimbi-dielectric-semiconductor prototype zvimiro, izvo zvakavakirwa paferroelectric hafnium oxide uye modhi yemunda-effect transistor. Iyo firimu yeMoS2 mune izvi zvimiro yakashanda semiconductor chiteshi. Kufambisa kwayo kwakadzorwa nekushandura polarization kutungamira kweferroelectric layer. Payakasangana neMoS2, iyo La:(HfO2-ZrO2) zvinhu, izvo zvakambogadzirwa muMIPT lab, zvakaonekwa zviine polarization yakasara inosvika gumi nemasere microcoulombs pa square centimita. Nekushingirira kwekuchinja kwemamiriyoni mashanu ekutenderera, yakapfuura rekodhi repasi rose re100,000 cycles for silicon channels.