Publications associated with Photovoltaics

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

Science (New York, N.Y.) Nature Research 369 (2020) 96-102

Y-H Lin, N Sakai, P Da, J Wu, HC Sansom, AJ Ramadan, S Mahesh, J Liu, RDJ Oliver, J Lim, L Aspitarte, K Sharma, P Madhu, AB Morales-Vilches, PK Nayak, S Bai, F Gao, CRM Grovenor, MB Johnston, JG Labram, JR Durrant, JM Ball, B Wenger, B Stannowski, HJ Snaith

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.

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