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The extension of the light absorption of photovoltaics into the near-infrared region is important to increase the energy conversion efficiency. Although the progress of the lead halide perovskite solar cells is remarkable, and high conversion efficiency of >20% has been reached, their absorption limit on the long-wavelength side is similar to 800 nm. To further enhance the conversion efficiency of perovskite-based photovoltaics, a hybridized system with near-infrared photovoltaics is a useful approach. Here we report a panchromatic sensitizer, coded DX3, that exhibits a broad response into the near-infrared, up to similar to 1100 nm, and a photocurrent density exceeding 30 mA cm(-2) in simulated air mass 1.5 standard solar radiation. Using the DX3-based dye-sensitized solar cell in conjunction with a perovskite cell that harvests visible light, the hybridized mesoscopic photovoltaics achieved a conversion efficiency of 21.5% using a system of spectral splitting.
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Michael Graetzel, Henry Snaith
Anand Agarwalla, Claudia Esther Avalos, Brian Irving Carlsen, David Lyndon Emsley, Wei Guo, Ulf Anders Hagfeldt, Dominik Józef Kubicki, Yuhang Liu, Haizhou Lu, Aditya Mishra, Mona Shasti, Wolfgang Richard Tress, Zaiwei Wang, Zishuai Wang, Wanchun Xiang, Jiahuan Zhang