Diminishing surface defect states in perovskite nancx^rystals is a highly challenging subject for enhancing optoelectronic device performance.We synthesized organic/inorganic lead-halide perovskite MAPbBr3(MA=methylam...Diminishing surface defect states in perovskite nancx^rystals is a highly challenging subject for enhancing optoelectronic device performance.We synthesized organic/inorganic lead-halide perovskite MAPbBr3(MA=methylammonium)clusters comprising nanocrystals with diameters ranging between 20 and 30 nm and characterized an enhanced photoluminescence(PL)quantum yield(as much as^7 times)by encapsulating the MAPbBr3 with graphene(Gr).The optical properties of MAPbBr3 and Gr/MAPbBr3 were investigated by temperature-dependent micro-PL and time-resolved PL measurements.Density functional theory calculations show that the surface defect states in MAPbBr3 are removed and the optical band gap is reduced by a 0.15 eV by encapsulation with graphene due to partial restoration of lattice distortions.展开更多
SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficie...SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficiency.Thus,how to boost the performance of ETL is of utmost importance and of urgent need in developing more efficient PSCs.展开更多
基金This work was supported by Basic Science Research Program and National H onor Scientist Program through the National Research Foundation of Korea(NRF)(Nos.2010-0020414,2015R1D1A1A01058332,2018R1D1A1B07043676,2019R1A4A1029237).K.S.K.acknowledges the support from KISTI(Nos.KSC-2018-CRE-0077,KSC-2018-CHA-0057).C.W.M.acknowledges the support from KISTI(Nos.KSC-2018-CRE-0071,KSC-2019-CRE-0139,KSC-2019-CRE-0248).
文摘Diminishing surface defect states in perovskite nancx^rystals is a highly challenging subject for enhancing optoelectronic device performance.We synthesized organic/inorganic lead-halide perovskite MAPbBr3(MA=methylammonium)clusters comprising nanocrystals with diameters ranging between 20 and 30 nm and characterized an enhanced photoluminescence(PL)quantum yield(as much as^7 times)by encapsulating the MAPbBr3 with graphene(Gr).The optical properties of MAPbBr3 and Gr/MAPbBr3 were investigated by temperature-dependent micro-PL and time-resolved PL measurements.Density functional theory calculations show that the surface defect states in MAPbBr3 are removed and the optical band gap is reduced by a 0.15 eV by encapsulation with graphene due to partial restoration of lattice distortions.
基金This work was supported by NRF(National Honor Scientist Program:2010-0020414)K.S.K.acknowledges the support from KISTI(KSC-2018-CHA-0057,KSC-2018-CRE-0077,KSC-2019-CRE-0103,KSC-2019-CRE-0253,KSC-2020-CRE-0049)+2 种基金C.W.M.acknowledges the support from KISTI(KSC-2018-CRE-0071,KSC-2019-CRE-0139,KSC-2019-CRE-0248)J.K.acknowledges the support from KISTI(KSC-2018-CRE-0055,KSC-2019-CRE-0064,KSC-2019-CRE-0244)J.K thanks to Dr.Sung Bum Kang for valuable discussions.
文摘SnO_(2) electron transport layer(ETL)has been spotlighted with its excellent electron extraction and stability over TiO_(2) ETL for perovskite solar cells(PSCs),rapidly approaching the highest power conversion efficiency.Thus,how to boost the performance of ETL is of utmost importance and of urgent need in developing more efficient PSCs.
