A piperidinium salt stabilizes efficient metal-halide perovskite solar cells

Journal article

Longevity has been a long-standing concern for hybrid perovskite photovoltaics. We demonstrate high-resilience positive-intrinsic-negative perovskite solar cells by incorporating a piperidiniumbased ionic-compound into the formamidinium-cesium lead-trihalide perovskite absorber. With the band gap 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 Confidential unencapsulated and encapsulated cells retain 80% and 95% of their peak and “post-burn-in” efficiencies for 1010 and 1200 hours at 60 and 85 degree Celsius, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.

Authors: Lin, Y-H; Sakai, N; Da, P; Wu, J; Sansom, H

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Association for the Advancement of Science
• Journal: Science
• Volume: 369
• Issue: 6499
• Pages: 96-102
• Publication date: 2020-07-03
• Acceptance date: 2020-05-05
• DOI: 10.1126/science.aba1628
• EISSN: 1095-9203
• ISSN: 0036-8075
• Language: English
• Keywords: FFR