Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Electron transfer kinetics is described by three factors according to Marcus theory. On the other hand, not all of experimentally observed electron transfer kinetics can be explained only with Marcus theory. In this work, we examined the effect of dye structure on the regeneration kinetics of oxidized dye by reduced species in the electrolyte in dye-sensitized solar cells (DSSCs). The regeneration kinetics was studied for DSSCs using Co complex redox couples and organic dyes which have donor-π-conjugated linker-acceptor (D-π-A) structure. Between two dyes which have diphenylamine added carbazole moiety as the donor part and have one (MKY1) or three (MK118) hexylthiophene, MKY1 showed faster regeneration rate than MK118 when the free energy difference (ΔG) between the levels of the dye's HOMO and redox couple in the electrolyte was comparable in the DSSCs. For the case of two dyes which have three hexylthiophenes in the π-conjugated linker part and have diphenylamine added carbazole (MK118) or carbazole (MK1) moiety, the regeneration kinetics was comparable between MK118 and MK1 under the configuration of solar cells giving similar ΔG. These results indicates that the diphenylamine of MK118 didn't affect the regeneration kinetics while the diphenylamine of MKY1 facilitated the regeneration kinetics. Under the conditions giving similar ΔG, smaller-number of hexylthiophene resulted in faster regeneration kinetics.
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