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1‐Alkyl‐1 H ‐imidazole‐Based Dipolar Organic Compounds for Dye‐Sensitized Solar Cells
Author(s) -
Velusamy Marappan,
Hsu YingChan,
Lin Jiann T.,
Chang CheWei,
Hsu ChaoPing
Publication year - 2010
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200900244
Subject(s) - dye sensitized solar cell , imidazole , thiophene , time dependent density functional theory , thiazole , photochemistry , alkyl , electron acceptor , excited state , chemistry , electron donor , energy conversion efficiency , density functional theory , materials science , stereochemistry , optoelectronics , computational chemistry , organic chemistry , electrode , electrolyte , catalysis , physics , nuclear physics
A series of donor–π–acceptor‐type organic dyes based on 1‐alkyl‐1 H ‐imidazole spacers 1 , 2 , 3 , 4 , 5 have been developed and characterized. The two electron donors are at positions 4 and 5 of the imidazole, while the electron‐accepting cyanoacrylic acid is incorporated at position 2 by a spacer‐containing heteroaromatic rings, such as thiophene and thiazole. Detailed investigation on the relationship between the structure, spectral and electrochemical properties, and performance of DSSC is described here. Dye‐sensitized solar cells (DSSCs) using dyes as the sensitizers exhibit good efficiencies, ranging from 3.06 to 6.35 %, which reached 42–87 % with respect to that of N719‐based device (7.33 %) fabricated and measured under similar conditions. Time‐dependent density functional theory (TDDFT) calculations have been performed on the dyes, and the results show that both electron donors can contribute to electron injection upon photo‐excitation, either directly or indirectly by internal conversion to the lowest excited state.