Citation: Di Xu, Hu-jiang Shen, Jun-jie Xie, Wei Wang, Hui-hui Yuan, Yu-yu Li, Tao Zhang, Xin-yu Chen, Yun-long He, Yu-mei Zhang. Screen Printing, Modification via Post-treatment and Application in Dye-sensitized Solar Cells of PEDOT:PSS Films[J]. Acta Polymerica Sinica, ;2019, 50(1): 36-43. doi: 10.11777/j.issn1000-3304.2018.18169 shu

Screen Printing, Modification via Post-treatment and Application in Dye-sensitized Solar Cells of PEDOT:PSS Films

Di Xu ¹ ,
Hu-jiang Shen ^1,, ,
Jun-jie Xie ¹ ,
Wei Wang ¹ ,
Hui-hui Yuan ¹ ,
Yu-yu Li ^1,2 ,
Tao Zhang ¹ ,
Xin-yu Chen ¹ ,
Yun-long He ¹ ,
Yu-mei Zhang ¹

1.
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899
2.
School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209

Corresponding author: Hu-jiang Shen, shenhujiang@mail.sic.ac.cn
Received Date: 23 July 2018
Available Online: 1 September 2018

Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) films were coated on fluorine-doped tin oxide (FTO) conductive glass substrates via facile screen printing, followed by a modification. The modification was realized through post-treatment, i.e., immersing the as-printed films into a mixed solution consisting of diluted H₂SO₄ and methanol, and baking at 120 °C after 10 min of dipping. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to investigate the surface morphology and the thickness changes of the films before and after treating. Electrical conductivity of the pristine and that of the treated films were calculated and compared, using sheet resistance and thickness, and the result was discussed based on X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. Finally, PEDOT:PSS films were used as counter electrodes of dye-sensitized solar cells (DSSCs). The catalytic activity of the PEDOT:PSS films toward I₃^– reduction reaction was characterized by electrochemical impedance spectroscopy (EIS), and the photovoltaic performance of DSSCs assembled by the films was evaluated under the irradiation of simulated AM 1.5G condition. The results demonstrate that, the amorphous PEDOT:PSS films are uniformly coated on FTO substrates after screen printing, and the surface morphology of PEDOT:PSS experiences significant change after the modification by post-treatment, with significantly decreased thickness and slightly increased roughness. The electrical conductivity has been enhanced to more than three times of that in the pristine film, due to the partial removal of PSS rather than the improvement of crystallinity. The catalytic activity toward I₃^– reduction reaction is greatly enhanced, and the photovoltaic performance of the DSSCs assembled is also obviously improved, with the photo conversion efficiency increases from 5.12% to 6.64%. The increased PEDOT/PSS mass ratio, electrical conductivity and roughness of the PEDOT:PSS films after post-treatment is believed to be responsible for the improvedment of the photovoltaic performance of the DSSCs.
- Poly(3,4-ethylenedioxythiophene),
- Post-treatment,
- Electrode material,
- Dye-sensitized solar cell
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