Preparation and Characterization of Squaraine Dyes containing Mono- and Bis-Anchoring Groups as the Light Absorber in Dye Sensitized Solar Cells

Title
Preparation and Characterization of Squaraine Dyes containing Mono- and Bis-Anchoring Groups as the Light Absorber in Dye Sensitized Solar Cells
Author(s)
이치환윤형진정미란이정관김성훈[김성훈]김재홍
Keywords
CHARGE-TRANSFER; HIGH-EFFICIENCY; PHOTOVOLTAIC PERFORMANCE; ORGANIC-DYES; TIO2 FILMS; ENERGY CONVERSION; MOLECULAR DESIGN; SPECTROSCOPY; ELECTROLYTE; ACID
Issue Date
201408
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.138, pp.148 - 154
Abstract
Enhancing the charge transfer rate in dye sensitized solar cells (DSSCs) is one of the most important criteria determining the cell efficiency. This paper reports a novel strategy for enhancing charge transfer between squaraine dyes and TiO2 by increasing the anchoring number. Symmetrical (SSQ) and unsymmetrical squaraine (USQ) sensitizers with different numbers of anchoring groups in their chromophores are synthesized. SSQ dye containing a bis-anchoring group shows better electronic coupling with TiO2 than the USQ dye with a mono-bridge. This enhanced electronic coupling leads SSQ to exhibit better photovoltaic performance, though smaller amounts of SSQ dye is loaded on the TiO2 than the USQ dye. Under standard global AM 1.5 solar conditions, the optimized SSQ-sensitized solar cells show 7.76 mA cm(-2) of short-circuit photocurrent density, 0.62 V of open-circuit voltage, and 0.65 of fill factor (FF), to give overall conversion efficiency of 3.20%, which is approximately 25% higher than the USQ-sensitized solar cells. (C) 2014 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/31357http://dx.doi.org/10.1016/j.electacta.2014.06.073
ISSN
0013-4686
Appears in Collections:
중앙도서관 > rims journal
공과대학 > 화학공학부 > Articles
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