Thermodynamically stabilized β-CsPbI 3 –based perovskite solar cells with efficiencies >18%
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- 9 August 2019
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 365 (6453), 591-595
- https://doi.org/10.1126/science.aav8680
Abstract
Although β-CsPbI3 has a bandgap favorable for application in tandem solar cells, depositing and stabilizing β-CsPbI3 experimentally has remained a challenge. We obtained highly crystalline β-CsPbI3 films with an extended spectral response and enhanced phase stability. Synchrotron-based x-ray scattering revealed the presence of highly oriented β-CsPbI3 grains, and sensitive elemental analyses—including inductively coupled plasma mass spectrometry and time-of-flight secondary ion mass spectrometry—confirmed their all-inorganic composition. We further mitigated the effects of cracks and pinholes in the perovskite layer by surface treating with choline iodide, which increased the charge-carrier lifetime and improved the energy-level alignment between the β-CsPbI3 absorber layer and carrier-selective contacts. The perovskite solar cells made from the treated material have highly reproducible and stable efficiencies reaching 18.4% under 45 ± 5°C ambient conditions.Keywords
Funding Information
- National Natural Science Foundation of China (51861145101,21777096)
- China Postdoctoral Science Foundation (2017M621466)
- the Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University (N/A)
- the OIST R and D Cluster Research Program (N/A)
- the OIST Proof of Concept (POC) Program (N/A)
- JSPS KAKENHI Grant (JP18K05266)
- Huoyingdong Grant (151046)
- Shanghai Shuguang Grant (17SG11)
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