For the bright future-bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%.

@article{Liang2010ForTB,
  title={For the bright future-bulk heterojunction polymer solar cells with power conversion efficiency of 7.4\%.},
  author={Yongye Liang and Zheng Xu and Jiangbin Xia and Szu-Ting Tsai and Yue Wu and Gang Li and Claire Ray and Luping Yu},
  journal={Advanced materials},
  year={2010},
  volume={22 20},
  pages={
          E135-8
        }
}
Sun is the largest carbon-neutral energy source that has not been fully utilized. Although there are solar cell devices based on inorganic semiconductor to efficiently harvest solar energy, the cost of these conventional devices is too high to be economically viable. This is the major motivation for the development of organic photovoltaic (OPV) materials and devices, which are envisioned to exhibit advantages such as low cost, flexibility, and abundant availability. [1] The past success in… 
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