Efficiency improvement of polymer solar cells by iodine doping |
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Authors: | Zuliang ZhuoFujun Zhang Jian WangJin Wang Xiaowei XuZheng Xu Yongsheng Wang Weihua Tang |
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Affiliation: | a Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China b Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract: | A series of poly(3-hexylthiophene) (P3HT)/(6,6)-phenyl C60 butyric acid methyl ester (PCBM) bulk hetero-junction polymer solar cells were fabricated with different iodine (I2) doping concentrations. The short circuit current density (Jsc) was increased to 8.7 mA/cm2 from 4 mA/cm2, meanwhile the open circuit voltage (Voc) was decreased to 0.52 V from 0.63 V when the iodine doping concentration is 5%. The optimized power conversion efficiency of polymer solar cells (PSCs) with iodine doping is about 1.51%, which should be attributed to the better charge carrier transport and collection, and the more photon harvesting due to the red shift of absorption peaks and the widened absorption range to the longer wavelength. The morphology and phase separation of polymer thin films were measured by atomic force microscopy (AFM). The phase separation of P3HT and PCBM has been distinctly increased, which is beneficial to the exciton dissociation. The photocurrent density of PSCs with iodine doping was increased compared with the PSCs without iodine doping under the same effective voltage. |
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Keywords: | Polymer solar cells Doping Absorption |
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