[1] [1] Becquerel A E. Compt. Rend. Acad. Sci., 1893. 9: 145.

[2] [2] Chapin D M, Fuller C S, Pearson G L. J. Appl. Phys., 1954, 25: 676.

[3] [3] Takamoto T, Kaneiwa M, Imizumi M, et al. Prog Photovoltaiscs, 2005, 13(6): 495.

[4] [4] Kallmann H, Pope M. J. Chem. Phys., 1959, 30: 585.

[5] [5] Tang C W. Appl. Phys. Lett., 1986, 48: 183.

[6] [6] Yu G, Pakbaz K, Heeger A J. Appl. Phys. Lett., 1994, 64: 3422.

[7] [7] Peet J, Kim J Y, Coates N E, et al. Nature Mater., 2007, 6: 497.

[8] [8] Chen H Y, Hou J, Zhang S, et al. Nature Photonics, 2009, 3: 649.

[9] [9] Dou L T, You J B, Yang J, et al. Nature Photonics, 2012, 6: 180.

[10] [10] Thompson B C, Fr chet J M J. Angew. Chem. Int. Ed., 2008, 47: 58.

[12] [12] Na S I, Kim S S, Kwon S S, et al. Appl. Phys. Lett., 2007, 91: 173509.

[13] [13] Huang Jingshun, Chou Chenyu, Lin Chingfuh. Solar Energy Materials & Solar Cells, 2010, 94: 182.

[14] [14] Zheng Y, Bekele R, Ouyang J M, et al. Organic Electronics, 2009, 10: 1621.

[15] [15] Ma W, Yang G, Gong X, et al. Adv. Funct. Mater., 2005, 15: 1617.

[16] [16] Kim K, Liu J, Namoothiry M A G, et al. Appl. Phys. Lett., 2007, 90: 163511.

[17] [17] Silvestri F, Irwin M D, Beverina L, et al. J. Am. Chem. Soc., 2008, 130: 17640.

[18] [18] Kitazawa D, Watanabe N, Yamamoto S. Appl. Phys. Lett., 2009, 95: 053701.

[19] [19] Zhang S Y, Chen Z J, Xiao L X, et al. Sol. Energ. Mater. & Sol. Cells, 2011, 95: 917.

[20] [20] Chen F C, Wu J L, Lee C L, et al. Appl. Phys. Lett., 2009, 95: 013305.