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Triarylamine-based dual-function coadsorbents with extended pi-conjugation aryl linkers for organic dye-sensitized solar cells

Authors
Choi, In TaekYou, Ban SeokEom, Yu KyungJu, Myung JongChoi, Won SeokKang, Sung HoKang, Min SooSeo, Kang DeukHong, Ji YeounSong, Sang HyunYang, Ji-WoonKim, Hwan Kyu
Issue Date
11월-2014
Publisher
ELSEVIER
Keywords
Dual-function coadsorbents; Extended pi-conjugation aryl linkers; Prevention of dye aggregation; Light-harvesting; Dye-sensitized solar cells
Citation
ORGANIC ELECTRONICS, v.15, no.11, pp.3316 - 3326
Indexed
SCIE
SCOPUS
Journal Title
ORGANIC ELECTRONICS
Volume
15
Number
11
Start Page
3316
End Page
3326
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/96979
DOI
10.1016/j.orgel.2014.09.008
ISSN
1566-1199
Abstract
Triarylamine-based dual-function coadsorbents containing a carboxylic acid acceptor linked by extended pi-conjugation aryl linkers (e.g., phenylene: HC-A3, naphthalene: HC-A4 and anthracene: HC-A5) were newly designed and synthesized. They were used as coadsorbents in organic dye-sensitized solar cells (DSSCs) based on a porphyrin dye (hexyloxy-biphenyl-ZnP-CN-COOH (HOP)). For comparison, the pi-conjugated phenyl linker (HC-A3) previously developed by our group was also used as a coadsorbent. The structural effects on the photophysical and electrochemical properties and DSSC performance were systematically investigated. As a result, the DSSCs based on HC-A4 and HC-5 displayed power conversion efficiencies (PCEs) of 8.2% and 5.1%, respectively, while the HC-A3-based DSSC achieved a PCE of 7.7%. In the case of HC-A4, both the short-circuit photocurrent densities (J(sc)) and open-circuit voltages (V-oc) of DSSCs were simultaneously improved to a large extent due to the more effective prevention of pi-pi stacking of organic dye molecules and the better light-harvesting effect at short wavelengths. The HC-A5-based DSSC exhibited a much lower short-circuit current (J(sc)) and open-circuit voltages (V-oc) compared to the HC-A4-based DSSC, due to the fact that the dihedral angle of the pi-conjugated linkers was too high for electron injection into the TiO2 conduction band (CB) level. This had a reduced effect on preventing the pi-pi stacking of dye molecules, resulting in lower J(sc) and V-oc values. (C) 2014 Elsevier B.V. All rights reserved.
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