Organometal Perovskite Light Absorbers Toward a 20% Efficiency - 副本.pdf

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Organometal Perovskite Light Absorbers Toward a 20% Efficiency - 副本.pdf

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Organometal Perovskite Light Absorbers Toward a 20% Efficiency - 副本

Organometal Perovskite Light Absorbers Toward a 20% Efficiency Low-Cost Solid-State Mesoscopic Solar Cell Nam-Gyu Park* School of Chemical Engineering and Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea ABSTRACT: Recently, perovskite CH3NH3PbI3 sensitizer has attracted great attention due to its superb light-harvesting characteristics. Organometallic or organic materials were mostly used as sensitizers for solid-state dye-sensitized solar cells at early stages. Inorganic nanocrystals have lately received attention as light harvesters due to their high light- absorbing properties. Metal chalcogenides have been investigated with solid-state dye- sensitized solar cells; however, the best power conversion efficiency was reported to be around 6%. CH3NH3PbX3 (X = Cl, Br, or I) perovskite sensitizer made a breakthrough in solid-state mescoscopic solar cells, where the first record efficiency of around 10% was reported in 2012 using submicrometer-thick TiO2 film sensitized with CH3NH3PbI3. A rapid increase in efficiency approaching 14% followed shortly. In this Perspective, recent progress in perovskite-sensitized solid- state mesoscopic solar cells is reviewed. On the basis of the recent achievements, a power conversion efficiency as high as 20% is expected based on optimized perovskite-based solid-state solar cells. Progress in Solid-State Dye-Sensitized Solar Cells. Since the first report of low-cost dye-sensitized solar cells (DSSCs) in 1991,1 a tremendous number of research papers have spouted during last two decades. As a consequence of the DSSC-related research efforts, the beginning efficiency of around 8% was improved to over 12%.2 High efficiency more than 12% was obtained using a 10 μm mesoporous TiO2 film sensitized with organic dyes and a cobalt-based redox electrolyte. Meanwhile, solid-state DSSC was introduced in 1998,3 where the liquid electrolyte was replaced by organic hole-transport material (HTM) such as 2,2′,7,7′-