@article{5f41cfb34529448c8a2fca7613290ef8,
title = "Grain-Boundaries-Engineering via Laser Manufactured La-Doped BaSnO3 Nanocrystals with Tailored Surface States Enabling Perovskite Solar Cells with Efficiency of 23.74%",
abstract = "Grain boundaries (GBs) engineering of hybrid perovskite films is of significance for accessing high performance perovskite solar cells (PSCs), owing to the abundant defect states existed therein originating from the low temperature film processing. Nanocrystals embedding at GBs has shown profound advantages in carrier dynamics modulation, while the surface defects on nanocrystals in turn lead usually to the trapping of carriers at GBs. The authors herein demonstrate the efficient GBs engineering via laser generated nanocrystals with tailored surface states for improved carriers dynamics and environmental stability of PSCs. The embedding of La doped BaSnO3 (LBSO) nanocrystals with bare surfaces in perovskite provides an additional channel to facilitate the effective carrier extraction and reduce the carrier recombination, leading to a maximum power conversion efficiency (PCE) of 21.11% with negligible hysteresis for the mixed-cation PSCs. To clarify the influence of surface defect states of the laser generated nanocrystals on the performance of PSCs, 1H,1H-perfluorooctylamine is grafted on LBSO nanocrystals during the laser irradiation, resulting in improved champion PCE up to 21.65% and pronounced environmental stability. The universal embedding of the LBSO nanocrystals with tailored surface states in different perovskite by fabricating FAPbI3 PSCs with a champion PCE of 23.74% is further demonstrated.",
keywords = "grain boundaries, nanocrystals, perovskite solar cells, pulsed laser irradiation, ternary metal oxide",
author = "Xiaokun Yang and Wenhao Zhao and Mingjie Li and Linfeng Ye and Pengfei Guo and Youxun Xu and Hang Guo and Huiwu Yu and Qian Ye and Hongyue Wang and Daniel Harvey and Dmitry Shchukin and Minjun Feng and Sum, {Tze Chien} and Hongqiang Wang",
note = "Funding Information: X.Y., W.Z., and M.L. contributed equally to this work. This work was financially supported by the project of National Key R&D Program for International Cooperation (2021YFE0115100), the National Natural Science Foundation of China (Nos. 52172101 and 51872240), Shaanxi Province Key Research and Development Program (2021ZDLGY14-08), the Fundamental Research Funds for the Central Universities (3102019JC005), and the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (2020GXLH-Z-018). The authors would like to thank the Analytical & Testing Center of Northwestern Polytechnical University and Shaanxi Materials Analysis and Research Center for ICP, XPS, SEM, and TEM characterizations. D.S. thanks financial support from Russian Science Foundation (grant 19-79-30091) provided for sample analysis. M.L., M.F., and T.C.S. acknowledge the financial support from the Nanyang Technological University start-up grant M4080514; the Ministry of Education AcRF Tier 1 grant RG91/19 and Tier 2 grant MOE2017-T2-2-002; the AME Individual Research Grant (A1883c0004), Agency for Science, Technology, and Research (A*STAR); and the Singapore National Research Foundation Investigatorship NRF-NRFI-2018-04. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = may,
day = "9",
doi = "10.1002/adfm.202112388",
language = "English",
volume = "32",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "19",
}