b Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China

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c Department of Advanced Materials & Nanotechnology, College of Engineering, Peking University, Beijing 100871, P. R. China E-mail: anyuan@pku.edu.cn

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X. Xia, S. Wang, Y. Jia, Z. Bian, D. Wu, L. Zhang, A. Cao and C. Huang, J. Mater. Chem., 2010, 20, 8478 DOI: 10.1039/C0JM02406F

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a Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R.China E-mail: bianzq@pku.edu.cn

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Transparent solar cells are very useful in making transparent electrical power supplies and tandem devices. We report the fabrication of semi-transparent polymer solar cells by replacing conventional metal electrode with a carbon nanotube film. The solar cells can be illuminated at both front and back sides, with power conversion efficiencies (up to 2.5%) comparable to cells using metal electrodes. The solar cells are highly transparent in near-infrared region, with an optical transmittance of nearly 80% in the range of 670 nm to 1.2 μm, and maintain a transmittance of above 60% through 1.2 to 2.5 μm. We further constructed a tandem structure with two subcells operating separately, in which the back cell receives infrared light transmitted through the front cell. Our infrared-transparent solar cells possess multiple functions such as serving as a light filter to drive a CdSe nanobelt photo-sensor with enhanced wavelength selectivity.