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      Lead-free Mixed Tin and Germanium Perovskites for Photovoltaic Application.

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          Abstract

          The power conversion efficiency (PCE) of lead halide perov-skite photovoltaics has reached to 22.1% with significantly improved structural stability, thanks to the mixed cation and anion strategy. However, the mixing element strategy has not been widely seen in the design of lead-free perovskites for photovoltaic application. Herein, we report a comprehensive study of a series of lead-free and mixed tin and germanium halide perovskite materials. Most importantly, we predict that RbSn0.5Ge0.5I3 possesses not only a direct bandgap within the optimal range of 0.9 - 1.6 eV, but also desirable optical absorp-tion spectrum that is comparable to those of the state-of-the-art methylammonium lead iodide perovskites, favorable effective masses for high carrier mobility, as well as high resistant to the water penetration than the prototype inorganic-organic lead-containing halide perovskite. If confirmed in the laboratory, this new lead-free inorganic perovskite may offer great promise as an alternative highly efficient solar absorber material for photovoltaic application.

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          Author and article information

          Journal
          J. Am. Chem. Soc.
          Journal of the American Chemical Society
          American Chemical Society (ACS)
          1520-5126
          0002-7863
          May 24 2017
          Article
          10.1021/jacs.7b04219
          28537073
          30a6b516-450a-4d23-bfe9-f2237de2e20d
          History

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