Journal
SCIENCE
Volume 369, Issue 6499, Pages 96-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aba1628
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Funding
- U. K. Engineering and Physical Sciences Research Council (EPSRC) [EP/S004947/1, EP/P006329/1]
- EPSRC [EP/M018237/1]
- Rhodes Scholarship (India)
- Penrose Scholarship
- Rhodes Scholarship (Worcester)
- EPSRC [EP/S004947/1, EP/P032591/1, EP/P006329/1] Funding Source: UKRI
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Longevity has been a long-standing concern for hybrid perovskite photovoltaics. We demonstrate high-resilience positive-intrinsic-negative perovskite solar cells by incorporating a piperidinium-based ionic compound into the formamidinium-cesium lead-trihalide perovskite absorber. With the bandgap tuned to be well suited for perovskite-on-silicon tandem cells, this piperidinium additive enhances the open-circuit voltage and cell efficiency. This additive also retards compositional segregation into impurity phases and pinhole formation in the perovskite absorber layer during aggressive aging. Under full-spectrum simulated sunlight in ambient atmosphere, our unencapsulated and encapsulated cells retain 80 and 95% of their peak and post-burn-in efficiencies for 1010 and 1200 hours at 60 degrees and 85 degrees C, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.
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