@article{Park2020, 
author = {Youngsin Park and Atanu Jana and Chang Woo Myung and Taeseung Yoon and Geungsik Lee and Claudius C. Kocher and Guanhua Ying and Vitaly Osokin and Robert A. Taylor and Kwang S. Kim},
title = {Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene},
year = {2020},
journal = {Nano Research},
volume = {13},
number = {4},
pages = {932-938},
keywords = {graphene, photoluminescence, density functional theory calculations, surface passivation, perovskite nanocluster},
url = {https://www.sciopen.com/article/10.1007/s12274-020-2718-8},
doi = {10.1007/s12274-020-2718-8},
abstract = {Diminishing surface defect states in perovskite nanocrystals 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.}
}