A piperidinium salt stabilizes efficient metal-halide perovskite solar cells.

A piperidinium salt stabilizes efficient metal-halide perovskite solar cells.

Science (New York, N.Y.) (2020-07-08)

Yen-Hung Lin, Nobuya Sakai, Peimei Da, Jiaying Wu, Harry C Sansom, Alexandra J Ramadan, Suhas Mahesh, Junliang Liu, Robert D J Oliver, Jongchul Lim, Lee Aspitarte, Kshama Sharma, P K Madhu, Anna B Morales-Vilches, Pabitra K Nayak, Sai Bai, Feng Gao, Chris R M Grovenor, Michael B Johnston, John G Labram, James R Durrant, James M Ball, Bernard Wenger, Bernd Stannowski, Henry J Snaith

PMID32631893

摘要

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° and 85°C, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.