Perovskite solar cells have made tremendous progress using laboratory-scale spin-coating methods in the past few years owing to advances in controls of perovskite film deposition. However, devices made via scalable methods are still lagging behind state-of-the-art spin-coated devices because of the complicated nature of perovskite crystallization from a precursor state. Here we demonstrate a chlorine-containing methylammonium lead iodide precursor formulation along with solvent tuning to enable a wide precursor-processing window (up to ∼8 min) and a rapid grain growth rate (as short as ∼1 min). Coupled with antisolvent extraction, this precursor ink delivers high-quality perovskite films with large-scale uniformity. The ink can be used by both spin-coating and blade-coating methods with indistinguishable film morphology and device performance. Using a blade-coated absorber, devices with 0.12-cm2 and 1.2-cm2 areas yield average efficiencies of 18.55% and 17.33%, respectively. We further demonstrate a 12.6-cm2 four-cell module (88% geometric fill factor) with 13.3% stabilized active-area efficiency output.
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The work at the National Renewable Energy Laboratory is supported by the US Department of Energy under Contract No. DE-AC36-08GO28308. We acknowledge the support by the hybrid perovskite solar cell program of the National Center for Photovoltaics funded by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office. We thank S. Mauger for help with XRF and viscosity measurement.
The authors declare no competing financial interests.
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Yang, M., Li, Z., Reese, M. et al. Perovskite ink with wide processing window for scalable high-efficiency solar cells. Nat Energy 2, 17038 (2017). https://doi.org/10.1038/nenergy.2017.38
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