Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Low-Temperature Chemical Sintered TiO2 Photoanodes Based on a Binary Liquid Mixture for Flexible Dye-Sensitized Solar Cells

  • Md. Mahbubur, Rahman (Department of Applied Chemistry, Konkuk University) ;
  • Hyeong Cheol, Kang (Department of Energy Materials Science and Engineering, Research Center for Photoenergy Harvesting & Conversion Technology (phct), Dongguk University) ;
  • Kicheon, Yoo (Department of Energy Materials Science and Engineering, Research Center for Photoenergy Harvesting & Conversion Technology (phct), Dongguk University) ;
  • Jae-Joon, Lee (Department of Energy Materials Science and Engineering, Research Center for Photoenergy Harvesting & Conversion Technology (phct), Dongguk University)
  • Received : 2022.03.29
  • Accepted : 2022.06.21
  • Published : 2022.11.30
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Abstract

A chemically sintered and binder-free paste of TiO2 nanoparticles (NPs) was prepared using a binary-liquid mixture of 1-octanol and CCl4. The 1:1 (v/v) complex of CCl4 and 1-octanol easily interacted chemically with the TiO2 NPs and induced the formation of a highly viscous paste. The as-prepared binary-liquid paste (PBL)-based TiO2 film exhibited the complete removal of the binary-liquid and residuals with the subsequent low-temperature sintering (~150℃) and UV-O3 treatment. This facilitated the fabrication of TiO2 photoanodes for flexible dye-sensitized solar cells (f-DSSCs). For comparison purposes, pure 1-octanol-based TiO2 paste (PO) with moderate viscosity was prepared. The PBL-based TiO2 film exhibited strong adhesion and high mechanical stability with the conducting oxide coated glass and plastic substrates compared to the PO-based film. The corresponding low-temperature sintered PBL-based f-DSSC showed a power conversion efficiency (PCE) of 3.5%, while it was 2.0% for PO-based f-DSSC. The PBL-based low- and high-temperature (500℃) sintered glass-based rigid DSSCs exhibited the PCE of 6.0 and 6.3%, respectively, while this value was 7.1% for a 500℃ sintered rigid DSSC based on a commercial (or conventional) paste.

Keywords

Acknowledgement

This research was supported by the Technology Development Program to Solve Climate Changes of the National Research Foundation, funded by the Ministry of Science, ICT & Future Planning (NRF-2016M1A2A2940912).

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