期刊
DYES AND PIGMENTS
卷 90, 期 3, 页码 304-310出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2011.01.009
关键词
Coumarin; Dye-sensitised solar cell; Low-band-gap chromophore; Ethylenedioxythiophene; Molecular orbitals
资金
- MKE (The Ministry of Knowledge Economy), Korea [IITA-2008-C1090-0804-0013]
- WCU (the Ministry of Education and Science) [R31-2008-000-10035-0]
- Ministry of Education, Science and Technology [2010K000973]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20103060010020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50310, R31-2011-000-10035-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A series of coumarin dyes containing a low-band-gap chromophore of ethylenedioxythiophene (EDOT), which comprises a coumarin moiety as the electron donor and a cyanoacrylic acid moiety as electron acceptor in D-pi-A chromophores, were developed for use in dye-sensitised solar cells (DSSCs). These coumarin dyes have been used to fabricate DSSCs using I-/I-3(-) liquid electrolytes and their device performances were compared with that of NKX-2677 as a standard dye. Even though HKK-CM2 and HKK-CM3 have more extended aromatic units than HKK-CM1, the degree of pi-conjugation in HKK-CM2 and HKK-CM3 is less efficient than that of HKK-CM1, due to the relatively larger torsion angle between the plane of the donor and that of the acceptor. It is also in a good agreement with Density Functional Theory (DFT) calculations. As a result, a solar cell based on HKK-CM1 sensitiser shows better photovoltaic performance with J(SC) 0114.2 mA cm(-2), V-OC of 0.60 V, and a fill factor of 0.70, corresponding to an overall conversion efficiency eta of 6.07% under the standard AM 1.5 irradiation, than HKK-CM2 and HKK-CM3-based solar cells. (C) 2011 Elsevier Ltd. All rights reserved.
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