期刊
ORGANIC ELECTRONICS
卷 52, 期 -, 页码 103-109出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2017.10.003
关键词
Co-sensitization; Flexible dye-sensitized solar cell; Metal-free organic dye; Unsymmetrical squaraine dye
资金
- BK21PLUS [21A20131912052]
- MIKE (Original Material Technology Program (RIAM) [I-AC12-13(0417-20130067)]
- KRICT [RIAM 0417-20170017]
- KIST [2E22831, 2K01970]
- World Class University (Ministry of Education, Science and Technology, Korea (MEST)) [R32-2010-000-10217]
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.
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