Iqembu lososayensi base-US-Canadian basebenzise ama-molecule e-Lewis ukuze bathuthukise ukudlula kwendawo kuseli yelanga ye-perovskite.Ithimba likhiqize idivayisi enevoltheji ephezulu yesekhethi evulekile kanye namazinga okuzinza amangalisayo.
Ithimba labacwaningi base-US-Canadian lenze i-perovskite ehlanekezelweiseli solarngokusebenzisa i-Lewis base molecules ukuze kudlule i-surface passivation.Izisekelo ze-Lewis zivame ukusetshenziswa ocwaningweni lwelanga le-perovskite ukuze kudlule ukukhubazeka okungaphezulu kwesendlalelo se-perovskite.Lokhu kunemiphumela emihle ekuqondaneni kwezinga lamandla, i-interfacial recombination kinetics, ukuziphatha kwe-hysteresis, nokuzinza kokusebenza.
"Isisekelo se-Lewis, esilinganisa ngokuphambene ne-electronegativity, kulindeleke ukuthi sinqume amandla okubopha kanye nokuzinza kwezindawo zokusebenzelana nemingcele yokusanhlamvu," kusho ososayensi, bephawula ukuthi ama-molecule abonakale esebenza kahle kakhulu ekudaleni isibopho esiqinile phakathi kwezingqimba zamangqamuzana. izinga lesixhumi esibonakalayo."I-molecule ye-Lewis enama-athomu amabili anikela ngama-elekthronikhi ingakwazi ukubopha kanye nezindawo zokuxhumanisa ibhuloho kanye nemingcele yaphansi, inikeze amandla okuthuthukisa ukunamathela nokuqinisa ukuqina komshini wamaseli elanga e-perovskite."
Ososayensi basebenzise i-diphosphine Lewis base molecule eyaziwa ngokuthi i-1,3-bis(diphenylphosphino) propane (DPPP) ukuze badlulise enye ye-halide perovskites ethembisa kakhulu - i-formamidinium lead iodide eyaziwa ngokuthi i-FAPbI3 - ukuze isetshenziswe ungqimba olumunca iseli.
Bafake isendlalelo se-perovskite kungqimba lwe-DPPP-doped hole transport (HTL) eyenziwe nge-nickel(II) oxide (NiOx).Baqaphele ukuthi amanye ama-molecule e-DPPP aphinde ahlakazeka futhi ahlukaniswa kukho kokubili isixhumi esibonakalayo se-perovskite/NiOx nasezifundeni ezingaphezulu kwe-perovskite, nokuthi i-crystallinity yefilimu ye-perovskite ithuthukile.Bathe lesi sinyathelo sithuthukisaokomshiniukuqina kwe-interface ye-perovskite/NiOx.
Abacwaningi bakhe iseli nge-substrate eyenziwe ngengilazi ne-tin oxide (FTO), i-HTL esekelwe ku-NiOx, ungqimba lwei-methyl-substituted carbazole(Me-4PACz) njengesendlalelo se-hole-transport, ungqimba lwe-perovskite, ungqimba oluncane lwe-phenethylammonium iodide (PEAI), ungqimba lwezokuthutha lwe-electron olwenziwa nge-buckminsterfullerene (C60), isendlalelo se-tin(IV) oxide (SnO2), kanye insimbi eyenziwe ngesiliva (Ag).
Ithimba liqhathanise ukusebenza kweseli yelanga elenziwe nge-DPPP nedivayisi eyireferensi engazange idlule ekwelashweni.Iseli elinezinsimbi lithole ukusebenza kahle kokuguqulwa kwamandla okungama-24.5%, ivolthi yesekethe evulekile engu-1.16 V kanye nesici sokugcwalisa esingu-82%.Idivayisi engahlehliwe ifinyelele ukusebenza kahle okungama-22.6%, i-voltage yesekethe evulekile engu-1.11 V kanye nesici sokugcwalisa esingu-79%.
"Ukuthuthukiswa kwesici sokugcwalisa kanye ne-open-circuit voltage kuqinisekisile ukuncishiswa kwe-defect defect ku-interface yangaphambili ye-NiOx / perovskite ngemva kokwelashwa kwe-DPPP," kusho ososayensi.
Abacwaningi baphinde bakhe iseli ene-doped enendawo esebenzayo engu-1.05 cm2 ezuze ukuguqulwa kwamandla.ukusebenza kahle okungafika ku-23.9%futhi ayizange ibonise ukucekelwa phansi ngemva kuka-1,500 h.
"Nge-DPPP, ngaphansi kwezimo ze-ambient - okungukuthi, akukho ukufudumeza okwengeziwe - ukusebenza kahle kokuguqulwa kwamandla kweseli kuhlale kuphezulu cishe amahora angu-3,500," kusho umcwaningi u-Chongwen Li."Amaseli elanga e-perovskite ashicilelwe ngaphambilini ezincwadini avame ukubona ukwehla okukhulu ekusebenzeni kwawo ngemuva kwamahora angu-1,500 kuya kwangu-2,000, ngakho-ke lokhu kuyintuthuko enkulu."
Iqembu, elisanda kufaka isicelo selungelo lobunikazi lobuchule be-DPPP, lethule ubuchwepheshe beselula “Kumklamo onengqondo wama-molecule ayisisekelo kaLewisezinzile futhi ephumelelayo inverted perovskite amaseli elanga,” esanda kunyatheliswa kuyi- Science.Leli thimba lihlanganisa izifundiswa zaseNyuvesi yaseToronto eCanada, kanye nososayensi baseNyuvesi yaseToledo, eNyuvesi yaseWashington, naseNorthwestern University e-United States.
Isikhathi sokuthumela: Feb-27-2023