期刊
NATURE ENERGY
卷 2, 期 5, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2017.38
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资金
- US Department of Energy [DE-AC36-08GO28308]
- National Center for Photovoltaics - US Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
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 similar to 8 min) and a rapid grain growth rate (as short as similar to 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-cm(2) and 1.2-cm(2) areas yield average efficiencies of 18.55% and 17.33%, respectively. We further demonstrate a 12.6-cm(2) four-cell module (88% geometric fill factor) with 13.3% stabilized active-area efficiency output.
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