Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (5): 974-981.doi: 10.1007/s40242-013-3084-9

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Photoinduced Charge Transfer Processes of Zinc Porphyrin Derivatives for Dye-sensitized Solar Cells

ZHAO Yi-dan1, FU Jing-jing1, LI Hai-bin1, DONG Hao2, LIAO Yi1   

  1. 1. Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China;
    2. Institute of Chemistry for Functionalized Material, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, P. R. China
  • Received:2013-03-04 Revised:2013-05-10 Online:2013-10-01 Published:2013-09-17
  • Contact: DONG Hao, LIAO Yi E-mail:sinodonghao@gmail.com;liaoy271@nenu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.11179033), the Program for New Century Excellent Talents in University of China(No.NCET-10-0011), the Beijing Natural Science Foundation, China(No.2132017) and Program for the Top Young Talents of Higher Learning Institutions of Beijing Municipality China.

Abstract:

We studied the excitation energies of zinc porphyrin(ZnP) and zinc porphyrin analogues(ZnP-R) with long-range corrected(LC) density functional theory. We compared three recent LC functionals, wB97XD, CAM-B3LYP, LC-wPBE and functionals B3LYP with the experiments. It was found that the low energy excitation is well predicted for ZnP with the LC-wPBE functional based on 6-31G(d) basis set. Excited-state geometry optimizations for all the compounds were carried out. It was shown that upon the photo-excitation nearly 1 e transferred to the acceptor unit[dodecafluorosubphthalocyanine, SubPc(F)12] and a highly polarized state formed in compound 5. But after the relaxation of the first excited state, the electron on the acceptor went back to the ZnP a little and then shifted from ZnP to the donor segment[bis(4-hexylphenyl)amino] partially. The computed excited-state radiative lifetime(τ) for compound 5 is 943 μs, which shows a reasonable agreement with the experimental observation. According to the long-lived exciton in strong push-pull compound 5, we proposed that electron injection to semiconductor might occur after vibrational relaxation of excited state.

Key words: Excitation energy, Long-range corrected(LC) functional, Zinc porphyrin, Zinc porphyrin analogue, Electron injection