Chemically tuned, bi-functional polar interlayer for TiO2 photoanode of fiber-shaped dye-sensitized solar cells

Title
Chemically tuned, bi-functional polar interlayer for TiO2 photoanode of fiber-shaped dye-sensitized solar cells
Authors
이중기엥가르민 후안 트란Manxiang WangGuicheng Liu
Keywords
Bi-functional polar inter layer; TuO2 Photoanode; fiber-shaped; dye-sensitized solar cells
Issue Date
2020-02
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 8, NO 5-2562
Abstract
A novel strategy to improve the performance of fibre-shaped dye-sensitized solar cells (FDSSCs) has been successfully implemented using a polar polymer interlayer made of poly(2-ethyl-2-oxazoline) (PEOx). The inclusion of the PEOx interlayer reduces the typical defect sites and interband trap sites that exist on the TiO2-nanotube-based photoanode of the FDSSC. A local built-in electric field, induced by the interfacial intrinsic polarity of the PEOx interlayer, promotes facile photogenerated charge injection/extraction kinetics at the TiO2/dye interface. The negative polarity present on the bottom part of the PEOx chain exhibits an electronic doping-like behaviour, passivating the TiO2 defect sites and reducing trap-assisted recombination, while the positive polarity present on the top part of the PEOx chain provides dye-rich anchoring sites to improve the N719 dye adsorption loading on the TiO2 surface. The charge collection efficiency, short-circuit current density, open-circuit voltage, and fill factor of FDSSCs with the novel TiO2@PEOx photoanodes are superior than those of FDSSCs with traditional TiO2 photoanodes, by approximately 16.94%, 8.57%, 14.08%, and 6.58%, respectively. Consequently, the power conversion efficiency (PCE) of the proposed FDSSC is considerably improved, reaching 11.22%. Thus, the PCE of the proposed FDSSC is improved by approximately 32.16% compared with that of the traditional FDSSC.
URI
http://pubs.kist.re.kr/handle/201004/70978
ISSN
2050-7488
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KIST Publication > Article
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