Improved efficiency and stability of Pb–Sn binary perovskite solar cells by Cs substitution
- Univ. of Washington, Seattle, WA (United States); Harbin Institute of Technology, Harbin (China); University of Washington
- Univ. of Washington, Seattle, WA (United States)
- Harbin Institute of Technology, Harbin (China)
Partially replacing Pb with Sn in organic–inorganic lead halide perovskites has been proven as a promising approach to reduce environmental toxicity and develop low bandgap (as low as 1.20 eV) perovskite solar cells (PVSCs) beneficial for constructing perovskite-based tandem solar cells. In this work, we demonstrated that partially replacing MA+ or FA+ with Cs+ in a Pb–Sn binary perovskite system can effectively retard the associated crystallization rate to facilitate homogenous film formation, subsequently resulting in enhanced device performance and stability, especially for high Sn-containing compositions. Here, the representative MA0.9Cs0.1Pb0.5Sn0.5I3 PVSC with a low Eg of 1.28 eV not only achieves an improved efficiency up to 10.07% but also possesses much improved thermal and ambient stability as compared to the pristine MAPb0.5Sn0.5I3 PVSC showing poorer efficiency (6.36%) and stability. Similarly, when Cs was introduced into FAPb1-xSnxI3 perovskite, enhanced performance was observed, affirming its general applicability and beneficial role in mediating the crystal growth and film formation of Pb–Sn binary perovskites.
- Research Organization:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Contributing Organization:
- This work was supported by the National Science Foundation (DMR-1608279), the Office of Naval Research (N00014-14-1- 0246), the Asian Office of Aerospace R&D (FA2386-15-1-4106), and the Department of Energy SunShot (DE-EE0006710). Alex K.-Y. Jen thanks the Boeing-Johnson Foundation for the nancial support. X. Liu acknowledges the State-Sponsored Scholarship for Graduate Students from the China Scholarship Council. Zhibin Yang acknowledges the nancial support from the State of Washington through the University of Washington Clean Energy Institute. The authors also thank Francis Lin and Ting Zhao for material synthesis.
- DOE Contract Number:
- EE0006710
- OSTI ID:
- 1343595
- Report Number(s):
- DOE-UW--Jen-27
- Journal Information:
- Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 46 Vol. 4; ISSN JMCAET; ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
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