@article{424caae269fa4cdb94aeee392064c1f2,
title = "Bimolecular Additives Improve Wide-Band-Gap Perovskites for Efficient Tandem Solar Cells with CIGS",
abstract = "Tandem solar cells coupling narrow- and wide-band-gap thin-film polycrystalline absorbers are attractive for achieving ultrahigh efficiency with low manufacturing cost. For established narrow-band-gap CIGS thin-film bottom cells, a challenge is to develop highly efficient polycrystalline wide-band-gap top cells. Here, we demonstrate a 1.68-eV (FA0.65MA0.20Cs0.15)Pb(I0.8Br0.2)3 wide-band-gap perovskite solar cell with an efficiency of ∼20% enabled by using PEAI and Pb(SCN)2 complementary additives in the perovskite precursor. The coupling of PEA+ and SCN− provides a synergistic effect that overcomes growth challenges with either additive individually and improves perovskite film quality with enhanced crystallinity, reduced formation of excess PbI2 (in comparison to using Pb(SCN)2 additive alone), lower defect density and energetic disorder, and an improved carrier mobility (∼47 cm2 V−1s−1) and lifetime (∼2.9 μs). When coupling a semi-transparent 1.68-eV perovskite top cell fabricated by this approach with a 1.12-eV CIGS bottom cell, we achieve 25.9%-efficient polycrystalline perovskite/CIGS 4-terminal thin-film tandem solar cells.",
keywords = "CIGS, carrier lifetime, defect density, perovskite solar cells, tandem, transport",
author = "Kim, {Dong Hoe} and Muzzillo, {Christopher P.} and Jinhui Tong and Palmstrom, {Axel F.} and Larson, {Bryon W.} and Chungseok Choi and Harvey, {Steven P.} and Stephen Glynn and Whitaker, {James B.} and Fei Zhang and Zhen Li and Haipeng Lu and {van Hest}, {Maikel F.A.M.} and Berry, {Joseph J.} and Mansfield, {Lorelle M.} and Yu Huang and Yanfa Yan and Kai Zhu",
note = "Funding Information: The work was supported by the U.S. Department of Energy under contract no. DE-AC36-08GO28308 with the Alliance for Sustainable Energy, the manager and operator of the National Renewable Energy Laboratory. D.H.K., K.Z., and Y.Y. acknowledge the support on perovskite synthesis and device fabrication and characterization from the U.S. Department of Energy SunShot Initiative under the Next Generation Photovoltaics 3 program ( DE-FOA-0000990 ). C.P.M., S.G., and L.M.M. acknowledge the support on CIGS solar cell fabrication and characterization from the U.S. Department of Energy{\textquoteright}s Office of Energy Efficiency and Renewable Energy under SunShot Initiative award #DE-EE00025810 and Solar Energy Technologies Office agreement # 30296 . C.C. and Y.H. acknowledge support from the Office of Naval Research (ONR) under grant number N000141812155 . D.H.K. acknowledges the support for data analysis and characterization from the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT ( NRF-2017R1A4A1015022 ). We acknowledge the support on the various structural, chemical, and optoelectronic characterizations of perovskites from the De-risking Halide Perovskite Solar Cells program of the National Center for Photovoltaics, funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office. We thank Dr. Paul Ndione for his support on the initial development of semi-transparent devices. The views expressed in the article do not necessarily represent the views of the DOE or the U.S. Government. Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",
year = "2019",
month = jul,
day = "17",
doi = "10.1016/j.joule.2019.04.012",
language = "English",
volume = "3",
pages = "1734--1745",
journal = "Joule",
issn = "2542-4351",
publisher = "Cell Press",
number = "7",
}