期刊
SCIENCE
卷 347, 期 6221, 页码 522-525出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa0472
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences [08SPCE973]
- LANL LORD program [XW11]
- U.S. Department of Energy under DOE [DE-EE0004946]
State-of-the-art photovoltaics use high-purity, large-area, wafer-scale single-crystalline semiconductors grown by sophisticated, high-temperature crystal growth processes. We demonstrate a solution-based hot-casting technique to grow continuous, pinhole-free thin films of organometallic perovskites with millimeter-scale crystalline grains. We fabricated planar solar cells with efficiencies approaching 18%, with little cell-to-cell variability. The devices show hysteresis-free photovoltaic response, which had been a fundamental bottleneck for the stable operation of perovskite devices. Characterization and modeling attribute the improved performance to reduced bulk defects and improved charge carrier mobility in large-grain devices. We anticipate that this technique will lead the field toward synthesis of wafer-scale crystalline perovskites, necessary for the fabrication of high-efficiency solar cells, and will be applicable to several other material systems plagued by polydispersity, defects, and grain boundary recombination in solution-processed thin films.
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