Self‐Doped and Crown‐Ether Functionalized Fullerene as Cathode Buffer Layer for Highly‐Efficient Inverted Polymer Solar Cells

F. Zhao, Dr. L. Jiang, Prof. C. Wang Key Laboratory of Molecular Nanostructure and Nanotechnology Institute of Chemistry Chinese Academy of Sciences 100190 Beijing , China E-mail: crwang@iccas.ac.cn F. Zhao University of Chinese Academy of Sciences 100049 Beijing , China Z. Wang, Dr. J. Zhang, Dr. X. Zhu, Dr. Y. Zhang, J. Fang, Dr. D. Deng, Prof. Z. Wei National Center for Nanoscience and Technology 100190 Beijing , China E-mail: weizx@nanoctr.cn Prof. Y. Li Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences 100190 Beijing , China

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