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Organic dyes incorporating low-band-gap chromophores based on pi-extended benzothiadiazole for dye-sensitized solar cells

Authors
Lee, Dong HyunLee, Myung JunSong, Hae MinSong, Bok JooSeo, Kang DeukPastore, MariachiaraAnselmi, ChiaraFantacci, SimonaDe Angelis, FilippoNazeeruddin, Mohammad K.Graeetzel, MichaelKim, Hwan Kyu
Issue Date
Nov-2011
Publisher
ELSEVIER SCI LTD
Keywords
Metal-free organic dyes; Low band-gap chromophore; Benzothiadiazole unit; Triphenylamine (TPA) unit; pi-Bridge units; Dye-sensitized solar cells
Citation
DYES AND PIGMENTS, v.91, no.2, pp.192 - 198
Indexed
SCIE
SCOPUS
Journal Title
DYES AND PIGMENTS
Volume
91
Number
2
Start Page
192
End Page
198
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/111315
DOI
10.1016/j.dyepig.2011.03.015
ISSN
0143-7208
Abstract
A series of new it-conjugated organic dyes (HKK-BTZ1, HKK-BTZ2, HKK-BTZ3 and HKK-BTZ4), comprising triphenylamine (TPA) moieties as the electron donor and benzothiadiazole moieties as the electron acceptor/anchoring groups, was synthesized for the use in dye-sensitized solar cells (DSSCs). TPA units are bridged to benzothiadiazole with single(S), double(D) and triple bonds(T) in different derivatives. And HKK-BTZ1 was modified by introducing alkoxy group of TPA unit, because the bulky alkoxy group is a strong donating group for the more red shift and for reducing aggregation of dyes in TiO(2) film. The structure-property relationship was investigated. Under standard global AM 1.5 G illumination, a maximum photo-to-electron conversion efficiency of 7.30% was achieved with the DSSC based on dye HKK-BTZ4 (J(SC) = 17.9 mA/cm(-2). V(OC) = 0.62 V, FF = 0.66), while the Ru dye N719-sensitized DSSC showed an efficiency of 7.82% with a J(SC) of 17.5 mA/cm(-2), a V(OC) of 0.62 V, and a FF of 0.72. (C) 2011 Elsevier Ltd. All rights reserved.
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