物理化学学报 >> 2011, Vol. 27 >> Issue (04): 875-880.doi: 10.3866/PKU.WHXB20110414

电化学和新能源 上一篇    下一篇

退火处理提高P3HT:PCBM聚合物太阳能电池光伏性能

卓祖亮, 张福俊, 许晓伟, 王健, 卢丽芳, 徐征   

  1. 北京交通大学发光与光信息教育部重点实验室, 北京 100044
  • 收稿日期:2010-12-13 修回日期:2011-01-24 发布日期:2011-03-29
  • 通讯作者: 张福俊 E-mail:fjzhang@bjtu.edu.cn
  • 基金资助:

    国家自然科学基金(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), 国家杰出青年基金(60825407),北京市自然科学基金(1102028), 高等学校学科创新引智计划(B08002)及高等学校基本科研业务基金(2011JBM123)资助项目

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

ZHUO Zu-Liang, ZHANG Fu-Jun, XU Xiao-Wei, WANG Jian, LU Li-Fang, XU Zheng   

  1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, P. R. China
  • Received:2010-12-13 Revised:2011-01-24 Published:2011-03-29
  • Contact: ZHANG Fu-Jun E-mail:fjzhang@bjtu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10804006, 60576016), Talent Plan of Red Berry of Beijing Jiaotong University, China, National Key Basic Research Program of China (973) (2010CB327704), National Outstanding Young Scientists Foundation of China (60825407), Natural Science Foundation of Beijing, China (1102028), Program of Introducing Talents of Discipline to Universities, China (B08002), and Fundamental Research Funds for the Central Universities, China (2011JBM123).

摘要:

利用旋转涂膜方法制备了以P3HT:PCBM为有源层的聚合物太阳能电池, 器件结构为ITO/PEDOT:PSS/P3HT:PCBM/Al(氧化铟锡导电玻璃/聚二氧乙基噻吩:聚对苯乙烯磺酸/聚三已基噻酚:富勒烯衍生物/铝),研究了退火温度对聚合物太阳能电池性能的影响. 实验发现: 聚合物薄膜经过120 °C退火10 min处理后, 开路电压(Voc)达到0.64 V, 短路电流密度(Jsc)为10.25 mA·cm-2, 填充因子(FF) 38.1%, 光电转换效率(PCE)达到2.00%. 为了讨论其内在机制, 对不同退火条件下聚合物薄膜进行了各种表征. 从紫外-可见吸收光谱中发现, 退火处理使P3HT在可见光范围内吸收加强且吸收峰展宽, 特别是在560和610 nm处的吸收强度明显增大; X射线衍射(XRD)结果表明, 120 °C退火后P3HT在(100)晶面上的衍射强度是未退火薄膜的2.8倍, 有利于光生载流子的输运; 原子力显微镜(AFM)研究结果表明, 退火显著增大了P3HT与PCBM的相分离程度, 提高了激子解离的几率; 傅里叶变换红外(FTIR)光谱验证了退火并没有引起聚合物材料物性的变化.

关键词: 聚合物太阳能电池, 相分离, 激子, 光电转换效率, 退火处理

Abstract:

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 (Voc) of 0.64 V, a short circuit current density (Jsc) 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 ππ* 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 undergo 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.

Key words: Polymer solar cells, Phase separation, Exciton, Power conversion efficiency, Annealing treatment

MSC2000: 

  • O646