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Organic Sensitizers Featuring a Planar Indeno[1,2‐ b ]‐thiophene for Efficient Dye‐Sensitized Solar Cells
Author(s) -
Lim Kimin,
Ju Myung Jong,
Song Juman,
Choi In Taek,
Do Kwangsuk,
Choi Hyeju,
Song Kihyung,
Kim Hwan Kyu,
Ko Jaejung
Publication year - 2013
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300281
Subject(s) - dye sensitized solar cell , energy conversion efficiency , chemistry , moiety , thiophene , photocurrent , photochemistry , electrolyte , solar cell , benzoic acid , materials science , organic chemistry , electrode , optoelectronics
An efficient organic sensitizer (JK‐306) featuring a planar indeno[1,2‐ b ]thiophene as the π‐linker of a bridging unit for dye‐sensitized solar cells (DSSCs) was synthesized. The sensitizer had a strong molar absorption coefficient and a red‐shifted absorption band compared with JK‐305, which resulted in a significant increase in the short‐circuit photocurrent density. We incorporated a highly congested bulky amino group into the 2′,4′‐dihexyloxybiphenyl‐4‐yl moiety, an electron donor, to diminish the charge recombination and to prevent aggregation of the sensitizer. Under standard AM 1.5G solar conditions, JK‐306‐sensitized cells in the presence of co‐adsorbents chenodeoxycholic acid (CDCA) and 4‐[bis(9,9‐dimethyl‐9 H ‐fluoren‐2‐yl)amino]benzoic acid (HC‐A), which afforded an overall conversion efficiency of 8.37 % and 8.52 %, respectively. Upon changing the I − /I 3 − electrolyte to the Co II /Co III redox couple, the cell gave rise to a significantly improved conversion efficiency of 10.02 % with the multifunctional HC‐A, which is one of the highest values reported for DSSCs with a cobalt‐based electrolyte. Furthermore, the JK‐306‐based solar cell with a polymer gel electrolyte revealed a high conversion efficiency of 7.61 %, which is one of the highest values for cells based on organic sensitizers.