Citation: ZHUO Zu-Liang, ZHANG Fu-Jun, XU Xiao-Wei, WANG Jian, LU Li-Fang, XU Zheng. Photovoltaic Performance Improvement of P3HT:PCBM Polymer Solar Cells by Annealing Treatment[J]. Acta Physico-Chimica Sinica, ;2011, 27(04): 875-880. doi: 10.3866/PKU.WHXB20110414 shu

Photovoltaic Performance Improvement of P3HT:PCBM Polymer Solar Cells by Annealing Treatment

1.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, P. R. China

Received Date: 13 December 2010
Available Online: 3 March 2011
Fund Project: 国家自然科学基金(10804006, 60576016) (10804006, 60576016) 北京交通大学红果园人才计划, 国家重点基础研究发展规划(973) (2010CB327704) (973) (2010CB327704) 国家杰出青年基金(60825407)，北京市自然科学基金(1102028) (60825407)，北京市自然科学基金(1102028) 高等学校学科创新引智计划(B08002) (B08002)高等学校基本科研业务基金(2011JBM123)资助项目 (2011JBM123)

Several polymer solar cells consisting of ITO/PEDOT:PSS/P3HT:PCBM/Al (indium tin oxide/ poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(3-hexylthiophene):[6,6]-phenyl C61-butyric acid methyl ester/aluminum cathode) were fabricated by spin coating. The influence of annealing temperature on the performance of the polymer solar cells was studied using absorption spectra, photoluminescence spectra, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM). These devices were treated at 120 °C for 10 min in an ambient atmosphere and the best power conversion efficiency (PCE) of 2.00% was obtained at an open circuit voltage (V_oc) of 0.64 V, a short circuit current density (J_sc) of 10.25 mA·cm^-2, and a fill factor (FF) of 38.1%. The intensities of the absorption peaks at 560 and 610 nm increased because of the increased absorption π→π^* transition of P3HT after annealing treatment. XRD spectra showed that the intensity of the diffraction peaks at (100) for P3HT increased 1.8 times by comparison with that of the cells that did not under annealing treatment. The P3HT:PCBM phase separation increased markedly after annealing treatment, which is valuable for exciton dissociation. FTIR results also showed that the polymer materials did not deteriorate during the annealing treatment process.
- Polymer solar cells,
- Phase separation,
- Exciton,
- Power conversion efficiency,
- Annealing treatment
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