Citation: LIN Xiao, WU Ming-Xing, AN Jiang, MIAO Qing-Qing, QIN Da, MA Ting-Li. Optimization of the Photoelectric Performance of Large-Scale All-Flexible Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2577-2582. doi: 10.3866/PKU.WHXB20111112 shu

Optimization of the Photoelectric Performance of Large-Scale All-Flexible Dye-Sensitized Solar Cells

1.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China

Received Date: 4 July 2011
Available Online: 2 September 2011
Fund Project: 国家自然科学基金(50773008) (50773008)国家高技术研究发展计划(863) (2009AA03Z220)资助项目 (863) (2009AA03Z220)

Highly efficient large scale flexible dye-sensitized solar cells (DSCs) were successfully designed and fabricated. By the introduction of a light scattering layer or pressure, the DSC efficiency was greatly improved. The flexible DSCs with a small surface area (0.4 cm × 0.4 cm) gave a high energy conversion efficiency of 5.50%. The energy conversion efficiencies of large area DSCs (2 cm×3 cm, active area of 2.7 cm²) improved from 1.52% to 1.81% and 2.50%, which is an increase of 20.0% and 66.7% compared with the DSCs prepared without any treatment. The 5 cm×7 cm DSCs (active area of 16.2 cm²) without any optimization showed an energy conversion efficiency of 1.60% under a sunlight intensity of 40 mW·cm^-2. The mechanism for the improvement in efficiency was also studied. The results of electrochemical impedance spectroscopy (EIS) demonstrated that the pressure method can significantly reduce the series resistance (R_s) and the charge transfer resistance (R_ct) in the TiO₂/dye/electrolyte interface. Scanning electron microscopy (SEM) showed that the TiO₂ particles were far more closely connected after pressing, which was helpful for electron transport in the TiO₂ network as well as for dye adsorption. In addition, the photovoltaic parameters of these flexible DSCs were found to be stable after the 900 h stability tests. The experimental results obtained for these flexible DSCs can be used as a foundation for further basic research and for industrialization technical research.
- All-flexibility,
- Solar cell,
- Scattering layer,
- Pressure method,
- Stability
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