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Nanotechnology. 2009 Apr 22;20(16):165202. doi: 10.1088/0957-4484/20/16/165202. Epub 2009 Mar 31.

High efficiency polymer solar cells with vertically modulated nanoscale morphology.

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  • 1Department of Material Science and Engineering, University of California, Los Angeles, CA 90095, USA.


Nanoscale morphology has been shown to be a critical parameter governing charge transport properties of polymer bulk heterojunction (BHJ) solar cells. Recent results on vertical phase separation have intensified the research on 3D morphology control. In this paper, we intend to modify the distribution of donors and acceptors in a classical BHJ polymer solar cell by making the active layer richer in donors and acceptors near the anode and cathode respectively. Here, we chose [6,6]-phenyl- C(61)-butyric acid methyl ester (PCBM) to be the acceptor material to be thermally deposited on top of [poly(3-hexylthiophene)] P3HT: the PCBM active layer to achieve a vertical composition gradient in the BHJ structure. Here we report on a solar cell with enhanced power conversion efficiency of 4.5% which can be directly correlated with the decrease in series resistance of the device.

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