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Organic Dyes with Well‐Defined Structures for Highly Efficient Dye‐Sensitised Solar Cells Based on a Cobalt Electrolyte
Author(s) -
Seo Kang Deuk,
Choi In Tack,
Kim Hwan Kyu
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201502289
Subject(s) - photocurrent , dye sensitized solar cell , energy conversion efficiency , materials science , moiety , organic solar cell , electrolyte , short circuit , photovoltaic system , open circuit voltage , photochemistry , chemical engineering , chemistry , optoelectronics , electrode , organic chemistry , voltage , polymer , engineering , composite material , ecology , physics , quantum mechanics , biology
Seven SGT organics dyes, containing bis‐dimethylfluoreneyl amino groups with a dialkoxyphenyl unit as an electron donor and a cyanoacrylic acid group as an anchoring group, connected with oligothiophenes, fused thiophenes and benzothiadiazoles as π‐bridges, were designed and synthesised for applications in dye‐sensitised solar cells (DSSCs). The photovoltaic performance of DSSCs based on organic dyes with oligothiophenes depends on the molecular structure of the dyes, in terms of the length change of the π‐bridging units. The best performance was found with a π‐bridge length of about 6 Å. To further enhance the photovoltaic performance associated with this concept, cyclopenta[1,2‐ b :5,4‐ b ′]dithiophene (CPDT) and benzothiadiazole were introduced into the π‐bridge unit. As a result, the DSSC based on the organic dye containing the CPDT moiety showed the best photovoltaic performance with a short‐circuit photocurrent density ( J sc ) of 14.1 mA cm −2 , an open‐circuit voltage ( V oc ) of 0.84 V and a fill factor ( FF ) of 0.72, corresponding to an overall conversion efficiency ( η ) of 8.61 % under standard AM 1.5 irradiation.

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