Citation: LI Dan, LIANG Ran, YUE He, WANG Peng, FU Li-Min, ZHANG Jian-Ping, AI Xi-Cheng. Influence of Donor and Acceptor Mass Ratios on P3HT:PCBM Film Structure and Device Performance[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1373-1379. doi: 10.3866/PKU.WHXB201204061 shu

Influence of Donor and Acceptor Mass Ratios on P3HT:PCBM Film Structure and Device Performance

1.
Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China

Received Date: 24 February 2012
Available Online: 6 April 2012
Fund Project: 国家自然科学基金(20933010, 21173266, 21133001) (20933010, 21173266, 21133001)国家重点基础研究项目(973) (2009CB20008)资助 (973) (2009CB20008)

Organic bulk heterojunction photovoltaic devices based on poly(3-hexylthiophene) (P3HT, donor) and [6, 6]-phenyl-C₆₁-butyric acid methyl ester (PCBM, acceptor) were fabricated using solvent annealing treatment. The nanoscale morphology and structure of the P3HT:PCBM blend films were characterized by UV-Vis absorption spectroscopy (UV-Vis), atomic force microscopy (AFM), and X-ray diffraction (XRD) analyses. In addition, the AFM images were processed using the entropyfilt method. The performances of the P3HT:PCBM devices with different mass ratios were measured, having a structure of indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/P3HT:PCBM/aluminium (Al). The results showed that the crystallinity of the P3HT polymer can be disturbed by the relative amount of PCBM molecules. The 1:1 (mass ratio) blend film possessed the greatest absorption width by UV-Vis absorption, as well as od phase separation and a high level of crystallinity, providing the best device performance (2.77%). This study indicates that the donor and acceptor mass ratios do have an influence on the nanoscale morphology and structure of the blend films, which can in turn affect the device performance.
- Blend mass ratio,
- Nanoscale morphology,
- Polymer solar cell,
- Entropyfilt,
- Power conversion efficiency
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