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International Journal of Photoenergy
Volume 2016 (2016), Article ID 6725106, 8 pages
Research Article

Fabrication and Optimization of Polymer Solar Cells Based on P3HT:PC70BM System

1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
2School of Materials Science & Engineering, South China University of Technology, Guangzhou 510640, China

Received 16 July 2016; Accepted 25 September 2016

Academic Editor: Gianmarco Griffini

Copyright © 2016 Huangzhong Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Efficient bulk heterojunction (BHJ) polymer solar cells (PSCs) based on P3HT:PC70BM were fabricated by optimizing the processing parameters. The optimized thickness and annealing temperature have been found to be about 200 nm and 130°C. The effect of cathode interfacial layers on device performance is related to the formation of interfacial dipole. Furthermore, the effect of optimum ZnO interfacial thickness (~30 nm) on device performance is attributed to good interfacial conductivity and its optical property. The metal electrode deposited in the slow rate has a better influence on device performance. Based on these optimal conditions, the best power conversion efficiency (PCE) of 3.91% was obtained under AM 1.5G and 100 mW/cm2 illumination. This detailed investigation provides an important reference for the fabrication and optimization of polymer photovoltaic devices.