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High-efficiency solution-processed perovskite solar cells with millimeter-scale grains

Wanyi NieMaterials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAHsinhan TsaiPhysical Chemistry and Applied Spectroscopy Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAReza AsadpourSchool of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USAJean‐Christophe BlanconPhysical Chemistry and Applied Spectroscopy Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAAmanda J. NeukirchCenter for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USAGautam GuptaMaterials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAJared CrochetPhysical Chemistry and Applied Spectroscopy Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAManish ChhowallaMaterials Science and Engineering, Rutgers University, Piscataway, NJ 08854, USASergei TretiakTheoretical Chemistry and Molecular Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAMuhammad A. AlamSchool of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USAHsing-Lin WangPhysical Chemistry and Applied Spectroscopy Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAAditya D. MohiteMaterials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

2015en

ABI

Annotatsiya

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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DOI: 10.1126/science.aaa0472

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