Near-IR organic sensitizers containing squaraine and phenothiazine units for dye-sensitized solar cells
- Authors
- Bae, Seong Hee; Seo, Kang Deuk; Choi, Won Seok; Hong, Ji Yeoun; Kim, Hwan Kyu
- Issue Date
- 2월-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Squaraine dye; Near-IR sensitization; Phenothiazine; Dye-sensitized solar cell; pi-Bridge units; Metal-free organic dyes
- Citation
- DYES AND PIGMENTS, v.113, pp.18 - 26
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 113
- Start Page
- 18
- End Page
- 26
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94534
- DOI
- 10.1016/j.dyepig.2014.07.031
- ISSN
- 0143-7208
- Abstract
- Unsymmetrical squaraine near-infrared (NIR) sensitizers with variable pi-bridge units, based on the donor-pi-squaraine core-acceptor structural motif, were synthesized and used as sensitizers for dye-sensitized solar cells. The phenothiazine as a donor group was linked to a squaraine core unit using various thiophene derivatives. Among them, three squaraine-based sensitizers have a carboxylic acid group as an electron-accepting group directly attached to the squaraine component, while one of four squaraine-based sensitizers has a cyanoacrylic acid as a more strongly electron-accepting group directly attached to the squaraine component. The sensitizers exhibited intense absorption in the NIR region and strong luminescence. The LUMO levels of the present squaraine-based sensitizers were slightly more negative than the conduction band edge of TiO2 photoanode. As a result, a solar cell based on the squaraine-based sensitizer containing a thiophene unit as a pi-bridge unit and a carboxylic acid group as an electron-accepting group exhibited better photovoltaic performance with a J(SC) of 6.0 mA cm(-2), a V-OC of 448 mV, and an FF of 0.73, corresponding to an overall conversion efficiency eta of 2.0%. (C) 2014 Elsevier Ltd. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.