Publication Date:
2019
Description:
〈p〉Although β-CsPbI〈sub〉3〈/sub〉 has a bandgap favorable for application in tandem solar cells, depositing and stabilizing β-CsPbI〈sub〉3〈/sub〉 experimentally has remained a challenge. We obtained highly crystalline β-CsPbI〈sub〉3〈/sub〉 films with an extended spectral response and enhanced phase stability. Synchrotron-based x-ray scattering revealed the presence of highly oriented β-CsPbI〈sub〉3〈/sub〉 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-CsPbI〈sub〉3〈/sub〉 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.〈/p〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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