A strategic buffer layer of polythiophene enhances the efficiency of bulk heterojunction solar cells.

@article{Wei2010ASB,
  title={A strategic buffer layer of polythiophene enhances the efficiency of bulk heterojunction solar cells.},
  author={Hung-Yu Wei and Jen-Hsien Huang and Kuo-Chuan Ho and Chih‐Wei Chu},
  journal={ACS applied materials \& interfaces},
  year={2010},
  volume={2 5},
  pages={
          1281-5
        }
}
We have developed polymer solar cells featuring a buffer layer of polythiophene (PT) sandwiched between the active layer and the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer. We attribute the improvement in power conversion efficiency of these polymer solar cells, relative to that of those based on poly(3-hexylthiophene):[6,6]-phenyl-C(61)-butyric acid methyl ester (P3HT:PCBM), to a reduction in the degree of carrier recombination at the junction interface. Because… 
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