Carrier lifetimes of >1 μs in Sn-Pb perovskites enable efficient all-perovskite tandem solar cells

By Jinhui Tong, Zhaoning Song, Dong Hoe Kim, Xihan Chen, Cong Chen, A. Palmstrom, P. Ndione, M. Reese, Sean P. Dunfield, O. Reid and 14 more. Science, 2019

867 citations recorded by the source corpus.

Efficient all-perovskite tandem cells Organic-inorganic perovskite films can boost the output of conventional silicon solar cells in tandem geometries by utilizing more of the light at the blue end of the solar spectrum. Tandem cells that use only perovskite films have been less successful because of the lack of a suitable material with a low bandgap that can replace silicon. Tong et al. report that a mixed tin-lead organic-inorganic material containing a small fraction of guanidinium thiocyanate has a low bandgap, long charge-carrier lifetime, and efficiencies around 25%. Science, this issue p. 475 The addition of guanidinium thiocyanate improves the performance of mixed tin-lead perovskite solar cells. 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.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/e5f54c86316f1da3f089de18ff2a5888b1a0c45f

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In Electrical and Electronic Engineering

1. K. Zhu
2. Edward H. Sargent
3. Yi Hou
4. D. Xue
5. S. De Wolf
6. Qiquan Qiao
7. J. Troughton
8. Derya Baran

In Polymers and Plastics

1. K. Zhu
2. Edward H. Sargent
3. Qiquan Qiao
4. J. Troughton
5. Derya Baran
6. M. Saidaminov

Citations in the corpus

• Efficient tandem solar cells with solution-processed perovskite on textured crystalline silicon (2020, background): “These properties also make PSCs attractive as top cells for tandem applications that use lower band gap bottom cells such as crystalline silicon (c-Si) and CIGS (7-18).”