CsI-Antisolvent Adduct Formation in All-Inorganic Metal Halide Perovskites
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- National Renewable Energy Laboratory Golden CO 80401 USA
- Department of PhysicsUniversity of Oxford Oxford OX1 3PU UK
- Department of ChemistryColorado School of Mines Golden CO 80401 USA
- National Renewable Energy Laboratory Golden CO 80401 USA; Department of Material Science and EngineeringStanford University Palo Alto CA 94305 USA
- National Renewable Energy Laboratory Golden CO 80401 USA; Department of ChemistryUniversity of Michigan Ann Arbor MI 48109 USA
- National Renewable Energy Laboratory Golden CO 80401 USA; Department of Chemical and Biological EngineeringUniversity of Colorado Boulder CO 80309 USA
The excellent optoelectronic properties shown by hybrid organic/inorganic metal halide perovskites are all predicated on precisely controlling the exact nucleation and crystallization dynamics that occur during film formation. In general, high-performance thin films are obtained by a method commonly called solvent engineering (or antisolvent quench) processing. The solvent engineering method removes excess solvent, but importantly leaves behind solvent that forms chemical adducts with the lead-halide precursor salts. These adduct-based precursor phases control nucleation and the growth of the polycrystalline domains. There has not yet been a comprehensive study comparing the various antisolvents used in different perovskite compositions containing cesium. In addition, there have been no reports of solvent engineering for high efficiency in all-inorganic perovskites such as CsPbI3. In this work, inorganic perovskite composition CsPbI3 is specifically targeted and unique adducts formed between CsI and precursor solvents and antisolvents are found that have not been observed for other A-site cation salts. These CsI adducts control nucleation more so than the PbI2-dimethyl sulfoxide (DMSO) adduct and demonstrate how the A-site plays a significant role in crystallization. The use of methyl acetate (MeOAc) in this solvent engineering approach dictates crystallization through the formation of a CsI-MeOAc adduct and results in solar cells with a power conversion efficiency of 14.4%.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- U.S. Department of Defense (DOD); USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; USDOE Office of Science (SC), Office of Workforce Development for Teachers and Scientists, Science Undergraduate Laboratory Internship (SULI) Program
- Grant/Contract Number:
- AC36-08GO28308; AC36‐08GO28308
- OSTI ID:
- 1598483
- Alternate ID(s):
- OSTI ID: 1596387
- Report Number(s):
- NREL/JA-5900-75166
- Journal Information:
- Advanced Energy Materials, Vol. 10, Issue 9; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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