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Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode

Title
Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode
Authors
Sung, Hye KyeongLee, YeonjuKim, Wook. Hyun.Lee, Sang-JuSung, Shi-JoonKim, Dae-HwanHan, Yoon Soo
DGIST Authors
Sung, Hye Kyeong; Lee, Yeonju; Kim, Wook. Hyun.; Lee, Sang-Ju; Sung, Shi-JoonKim, Dae-Hwan; Han, Yoon Soo
Issue Date
2020-04
Citation
Molecules, 25(7), 1502
Type
Article
Article Type
Article
Author Keywords
sodium sulfidedye-sensitized solar cellconduction band edge shiftsurface modification
Keywords
LIGHT PHOTOCATALYTIC ACTIVITYSHELL NANOPOROUS ELECTRODENANOCRYSTALLINE TIO2PERFORMANCEINJECTIONFILMSRECOMBINATIONCOADSORBENTIMPROVEMENT
ISSN
1420-3049
Abstract
By simple soaking titanium dioxide (TiO2) films in an aqueous Na2S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (Voc) and the fill factor (FF) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV-visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na2S modification led to the formation of anions on the TiO2 surface, and thereby shifted the conduction band edge of TiO2 in the negative (upward) direction, inducing an increase of 29 mV in the Voc. It was also found that the increased FF value in the surface-treated device was attributed to an elevation in the shunt resistance. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
URI
http://hdl.handle.net/20.500.11750/11896
DOI
10.3390/molecules25071502
Publisher
MDPI
Related Researcher
  • Author Sung, Shi-Joon  
  • Research Interests Compound Semiconductor Materials & Processes
Files:
Collection:
Division of Energy Technology1. Journal Articles


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