• 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.; Labram, J.G.; Durrant, J.R.; Ball, J.M.; Wenger, B.; Stannowski, B.; Snaith, H.J.: A piperidinium salt stabilizes efficient metal-halide perovskite solar cells. Science 369 (2020), p. 96-102

10.1126/science.aba1628
Open Access version by external provider

Abstract:
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.