Composition and annealing effects in polythiophene/fullerene solar cells

被引：0
|
作者：
Y. Kim
S. A. Choulis
J. Nelson
D. D. C. Bradley
S. Cook
J. R. Durrant
机构：
[1] Imperial College London,Center for Electronic Materials and Devices, Department of Physics, Blackett Laboratory
[2] Imperial College London,Center for Electronic Materials and Devices, Department of Chemistry
来源：
Journal of Materials Science | 2005年 / 40卷
关键词：
Atomic Force Microscopy; Solar Cell; Power Conversion Efficiency; Power Conversion; Annealing Effect;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We have fabricated organic solar cells with blends of regioregular poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM) as electron donor and electron acceptor, respectively. Blend composition and device annealing effects were investigated with optical absorption and photoluminescence spectroscopy, atomic force microscopy, photocurrent spectroscopy, and current-voltage characteristic measurements on devices under monochromatic or air mass (AM) 1.5 simulated solar light illumination. The highest efficiency was achieved for the 1:1 (P3HT:PCBM) weight ratio composition. The good performance is attributed to an optimized morphology that enables close intermolecular packing of P3HT chains. Inferior performance for the 1:2 composition is attributed to poorer intermolecular packing with increased PCBM content, while phase segregation on a sub-micron scale was observed for the 1:4 composition. The power conversion efficiency (AM 1.5) was doubled by the thermal annealing of devices at 140∘C to reach a value of 1.4%.
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页码：1371 / 1376
页数：5
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