| Literature DB >> 31000592 |
Jinhui Tong1,2, Zhaoning Song3, Dong Hoe Kim1, Xihan Chen1, Cong Chen3, Axel F Palmstrom1, Paul F Ndione1, Matthew O Reese1, Sean P Dunfield1,2,4, Obadiah G Reid1,2, Jun Liu1, Fei Zhang1, Steven P Harvey1, Zhen Li1, Steven T Christensen1, Glenn Teeter1, Dewei Zhao3, Mowafak M Al-Jassim1, Maikel F A M van Hest1, Matthew C Beard1, Sean E Shaheen2,5, Joseph J Berry6, Yanfa Yan7, Kai Zhu6.
Abstract
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.Entities:
Year: 2019 PMID： 31000592 DOI： 10.1126/science.aav7911
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728