A piperidinium salt stabilizes efficient metal-halide perovskite solar cells

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.

Source: ScienceNOW - July 1, 2020 Category: Science Authors: Lin, Y.-H., Sakai, N., Da, P., Wu, J., Sansom, H. C., Ramadan, A. J., Mahesh, S., Liu, J., Oliver, R. D. J., Lim, J., Aspitarte, L., Sharma, K., Madhu, P. K., Morales-Vilches, A. B., Nayak, P. K., Bai, S., Gao, F., Grovenor, C. R. M., Johnston, M. B., Lab Tags: Materials Science reports Source Type: news