... of low-bandgap polymers with deep LUMO levels. Angew. Chem. Int. Ed., Vol. 49, No. 43, (October 2010), pp. (79 92 79 95), ISSN: 1521- 377 3 Solar Cells – New Aspects and Solutions 474 Zhou, ... poly(2 ,7- carbazole) derivatives for solar cells. Journal of the American Chemical Society, Vol.130, No.2, (January 2008), pp. 73 2 -74 2, ISSN 1520-5126 Solar Cells – New Aspects and Solutions ... properties. Polyfluorene, however, has a band gap of ~3.0eV, which limits its application in Solar Cells – New Aspects and Solutions 478 M Zn(CH2COO) and 0.1 M Na2S aqueous solution for...