Jinhui Tong; Zhaoning Song; Dong Hoe Kim; Xihan Chen; Cong Chen; Axel F. Palmstrom; Paul F. Ndione; Matthew O. Reese; Sean P. Dunfield; Obadiah G. Reid; Jun Liu; Fei Zhang; Steven P. Harvey; Zhen Li; Steven T. Christensen; Glenn Teeter; Dewei Zhao; Mowafak Al‐Jassim; Maikel F. A. M. van Hest; Matthew C. Beard; Sean E. Shaheen; Joseph J. Berry; Yanfa Yan; Kai Zhu · 2019 · Science
Paper
All-perovskite-based polycrystalline thin-film tandem solar cells have the potential to deliver efficiencies of >30%. However, the performance of all-perovskite-based tandem devices has been limited by the lack of high-efficiency, low-band gap tin-lead (Sn-Pb) mixed-perovskite solar cells (PSCs). We found that the addition of guanidinium thiocyanate (GuaSCN) resulted in marked improvements in the structural and optoelectronic properties of Sn-Pb mixed, low-band gap (~1.25 electron volt) perovskite films. The films have defect densities that are lower by a factor of 10, leading to carrier lifetimes of greater than 1 microsecond and diffusion lengths of 2.5 micrometers. These improved properties enable our demonstration of >20% efficient low-band gap PSCs. When combined with wider-band gap PSCs, we achieve 25% efficient four-terminal and 23.1% efficient two-terminal all-perovskite-based polycrystalline thin-film tandem solar cells.
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