Effects of the number of chromophores and the bulkiness of a nonconjugated spacer in a dye molecule on the performance of dye-sensitized solar cells

Title
Effects of the number of chromophores and the bulkiness of a nonconjugated spacer in a dye molecule on the performance of dye-sensitized solar cells
Author(s)
김재홍김명석양현식한윤수[한윤수]정대영
Keywords
HIGH-EFFICIENCY; PHOTOVOLTAIC CELLS; COUMARIN DYES; ORGANIC-DYES; TIO2 FILMS; CONVERSION; TITANIA; DESIGN; LIGHT; ACID
Issue Date
201303
Publisher
ELSEVIER SCIENCE BV
Citation
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, v.420, pp.22 - 29
Abstract
Three organic photosensitizers, Single-, Double- and Triple-CBZ, containing one, two or three carbazole-based chromophores, respectively, and a nonconjugated spacer in each molecule, were designed and successfully synthesized. The electro-optical and photovoltaic properties of the photosensitizers were investigated in terms of molecular microstructure, i.e., the number of the chromophores and the bulkiness of the nonconjugated spacer. A dye-sensitized solar cell (DSSC) based on Triple-CBZ containing three carbazole chromophores and a bulky tris(hexyloxyphenyl)ethane (THPE) spacer showed a considerably improved power conversion efficiency (PCE) of over 55%, mainly due to the enhanced open-circuit voltage (Voc) and short circuit current, when compared with that of the DSSC with Double-CBZ (or Single-CBZ) containing two (or one) carbazole chromophores and a hexyl spacer. More chromophores in the dye molecule increased the molar extinction coefficient, thereby enhancing the energy harvesting efficiency. In addition, a bulkier spacer was favorable for effectively protecting the charge recombination between TiO2 and electrolytes, thereby improving Voc by the longer electron lifetime. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26279http://dx.doi.org/10.1016/j.colsurfa.2012.12.025
ISSN
0927-7757
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공과대학 > 화학공학부 > Articles
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