Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202103933
Keywords
inorganic perovskites; solar cells; ionic liquids; surface passivation; structural modulations; wide bandgap
Categories
Funding
- National Ten Thousand Talent Program for Young Top-notch Talent
- National Natural Science Fund for Excellent Young Scholars [52022030]
- National Natural Science Fund for Distinguished Young Scholars [51725201]
- National Natural Science Foundation of China [51972111, 51902185]
- International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China [51920105003]
- Innovation Program of Shanghai Municipal Education Commission [E00014]
- Fundamental Research Funds for the Central Universities [JKD01211623, JKVD1211041]
- Fundamental Research Funds of Free Exploration of Science, Technology and Innovation Commission of Shenzhen Municipality [2021Szvup039]
- Shanghai Engineering Research Center of Hierarchical Nanomaterials [18DZ2252400]
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A chemical etching strategy using ionic liquids is developed to improve the efficiency and environmental resilience of perovskite-based optoelectronic devices.
The existence of a defective area composed of nanocrystals and amorphous phases on a perovskite film inevitably causes nonradiative charge recombination and structural degradation in perovskite photovoltaics. In this study, a stoichiometric etching strategy for the top surface of a defective cesium lead halide perovskite is developed by using ionic liquids. The dissolution of the original defective area substantially exposes the underlying perovskite, which is a high-quality surface with retained stoichiometry and lattice continuity. The ionic liquid molecules are adsorbed on the perovskite surface via Coulombic interactions and passivate the undercoordinated surface lead centers. Such a structural modulation considerably reduces the trap density of the perovskite devices and enables a record power conversion efficiency of 17.51% and an open-circuit voltage of 1.37 V of the CsPbI2Br cell with a perovskite bandgap of 1.88 eV. This work provides a novel technical route to improve the efficiency and environmental resilience of perovskite-based optoelectronic devices.
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