Citation: DAI Yu-Hua, LI Xiao-Jie, FANG Yan-Yan, SHI Qiu-Fei, LIN Yuan, YANG Ming-Shan. Influence of Polymer Gel Electrolyte on the Performance of Dye-Sensitized Solar Cells Analyzed by Electrochemical Impedance Spectroscopy[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201206191 shu

Influence of Polymer Gel Electrolyte on the Performance of Dye-Sensitized Solar Cells Analyzed by Electrochemical Impedance Spectroscopy

1.
1. Beijing Key Laboratory of Special Elastomer Composite Materials, Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China;
2. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
3. Key Laboratory of Photochemistry, Center for Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences, Beijing 100080, P. R. China

Received Date: 6 April 2012
Available Online: 19 June 2012
Fund Project: 国家自然科学基金(51103013) (51103013) 北京市教育委员会科技计划(KM201110017007) (KM201110017007)北京市属高等学校人才强教计划(PHR201108359)资助项目 (PHR201108359)

The effects of gel electrolyte polymer matrix structure and composition on the photovoltaic properties of quasi-solid state dye-sensitized solar cells (DSSCs) were investigated using two series of copolymers, poly(hydroxy ethyl methacrylate-N-vinyl) pyrrolidone P(HEMA-NVP) and poly(methyl methacrylate- N-vinyl pyrrolidone) P(MMA-NVP), by electrochemical impedance spectroscopy (EIS). P(HEMA-NVP) copolymers with various crosslinking agent and N-vinyl pyrrolidone (NVP) contents, as well as P(MMA-NVP) copolymers with various NVP content, absorbed liquid electrolyte to form gel electrolytes HGelI, HGelII, and MGel, respectively. It was found that with increasing copolymer P(HEMA-NVP) crosslinking agent content, from 0.1 to 0.6% (w), the power conversion efficiency (η) of DSSCs based on HGelI initially increased and then decreased. A maximum conversion efficiency of 5.54% at 100 mW·cm^-2 was observed when crosslinker content was 0.4% (w). Meanwhile, we compared the parameters of DSSCs based on HGelII with those of DSSCs based on MGel. The conversion efficiencies of the former, which contained hydroxy groups, were all higher than those of the latter, while the open circuit voltages (V_oc) of the latter were larger than those of the former. DSSCs assembled with HGelII with a HEMA content of 60% exhibited the highest conversion efficiency, at 100 mW·cm-2. Electrochemical impedance spectroscopy (EIS) investigations showed that copolymer crosslinking structure affected the internal resistance and ionic conductivity of the resulting DSSCs, while addition of hydroxy groups decreased the interfacial resistance. Thus, the photovoltaic performance of DSSCs can be improved by tuning the crosslinking structure and the hydroxy content of the copolymer.
- Dye-sensitized solar cell,
- Polymer electrolyte,
- Electrochemical impedance spectroscopy,
- Hydroxy group,
- Crosslinking structure,
- Photovoltaic performance
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