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Anode engineering for photocurrent enhancement in a polymer solar cell and applied on plastic substrate |
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| Authors: | Hsing-Wang TsaiZingway Pei Chun-Chao ChenShor-Jeng Cheng Wei-Shung HsiehPei-Wen Li Yi-Jen Chan |
| Affiliation: | a Department of Electrical Engineering, National Central University, Chungli 32001, Taiwan, ROC b Graduate Institute of Optoelectronic Engineering, Department of Electrical Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC c Electronics and Optoelectronics Research Laboratories (EOL), Industrial Technology Research Institute (ITRI), Hsinchu 31040, Taiwan, ROC |
| Abstract: | In this work, a multilayer structure, PEDOT:PSS/insulator/PEDOT:PSS (CIC), was designed and used as the anode in a polymer solar cell (PSC) to enhance the efficiency at low annealing temperature. The efficiency for PSC with CIC multilayers could increase around 22% as compared to the reference cell. The internal electrical field enhancement due to the effective work function increase by CIC multilayer was assumed and responded to efficiency enhancement. The work function of the multilayer anode structure was explored by an electrostatic force microscopy (EFM) analysis. The EFM result shows that the surface potential of PEDPT:PSS in CIC structure is around 0.6 V higher than PEDOT:PSS in reference structure, indicating a higher work function for PEDOT:PSS in multilayer structure. By the input photon-to-current conversion efficiency (IPCE) study, the major enhancement in photocurrent occurred at solar spectrum range of 400-650 nm. Further applied to plastic substrate, the PSC exhibits 9.2% enhancement in efficiency. |
| Keywords: | Anode structure Photocurrent Polymer solar cell Plastic and electrical field |
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