Thermodynamically stabilized β-CsPbI<sub>3</sub>-based perovskite solar cells with efficiencies >18.
basic_science · Level V
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- Record sourced from PubMed, PMID 31395783.
- Also identified by DOI 10.1126/science.aav8680.
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Abstract
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.