Co-sensitization of metal free organic dyes in flexible dye sensitized solar cells

Title
Co-sensitization of metal free organic dyes in flexible dye sensitized solar cells
Authors
김동영김지헌이호림서용석
Keywords
Co-sensitization; Flexible dye-sensitized solar cell; Metal-free organic dye; Unsymmetrical squaraine dye
Issue Date
2018-01
Publisher
Organic electronics
Citation
VOL 52-109
Abstract
A metal-free organic dye (JH-1) and an unsymmetrical squaraine dye (SQ2) were used for co-sensitization of a flexible TiO2 electrode in order to obtain a broad spectral response in the visible light regions. Because of enhanced light absorption, the performance of the flexible plastic dye-sensitized solar cells (DSSCs) was enhanced. The dye concentration of co-sensitized TiO2 film was higher than that of individual dye-sensitized TiO2 film, leading to improved photovoltaic performance with the panchromatic light harvesting of JH-1 and SQ2 (350-720 nm). Optimum molar ratio of individual dye, dye concentration and adsorption kinetics onto the TiO2 photoelectrode, and ideal thickness of HS-TiO2 layer have been investigated. A flexible DSSC co-sensitized with the molar ratio of 60:40 (JH-1:SQ2) and Ti2 film thickness of 6 mu m yielded a high photocurrent density of 12.32 mA cm(-2), an open circuit voltage of 0.754 V, a fill factor of 0.68, and a power conversion efficiency of 6.31% under 1 sun illumination (100 mW cm(-2)). Interestingly, the co-sensitizers did not compete with each other for the absorption. Both the open circuit photovoltage and the photocurrent density were unexpectedly increased with co-sensitization which means that enhancement in photocurrents can be achieved without sacrificing the open circuit photovoltage for the co-sensitized solar cells, once the electron recombination and dye aggregation are retarded by the co-sensitization.
URI
http://pubs.kist.re.kr/handle/201004/68128
ISSN
1566-1199
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KIST Publication > Article
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