Ankit Kumar et al 2009 Nanotechnology 20 165202 doi:10.1088/0957-4484/20/16/165202
Ankit Kumar1, Gang Li2, Ziruo Hong1 and Yang Yang1,2
Show affiliationsNanoscale 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- C61-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.
84.60.Jt Photoelectric conversion: solar cells and arrays
81.07.-b Nanoscale materials and structures: fabrication and characterization
Soft matter, liquids and polymers
Issue 16 (22 April 2009)
Received 19 January 2009, in final form 26 February 2009
Published 31 March 2009
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