Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells

Title
Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells
Authors
Yu Seok YangHyung Do Kim류장현김경곤Sung Soo ParkKwang-Soon AhnJae Hong Kim
Keywords
Dye-sensitized solar cells; Organic dyes; Multi-anchoring groups; Short-circuit current enhancement; Thiophene bridge; Structure optimization
Issue Date
2011-05
Publisher
Synthetic metals
Citation
VOL 161, NO 9-10, 850-855
Abstract
Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current (11.6mAcm−2), compared with that of the dye with the single electron acceptor (10.2mAcm−2) and the conventional N3 Ru-dye (10.4mAcm−2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO2.
URI
http://pubs.kist.re.kr/handle/201004/45619
ISSN
0379-6779
Appears in Collections:
KIST Publication > Article
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