Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Abstract: To improve the light-to-electron-energy conversion in dye-sensitized solar cells (DSSCs), D-(pi-A)2 organic dye can provide the better light harvesting and higher molar extinction coefficient. In this article, a series of new push-pull phenothiazine-based sensitizers featuring various pi-conjugated linker, such as thiophene, 3-hexylthiophene, and 4-hexyl-2,2'-bithiophene between the phenothiazine donor and the double acceptors/anchors. Among them, the best conversion efficiency (7.31%) reaches approximately 99% of the N719-based (7.38%) DSSCs fabricated and measured under simulated one-sun illumination (AM1.5G, 100mW cm-2). The dye with two anchors have more efficient interfacial charge generation and transport compared to their congener with only single anchor, therefore, photocurrent can be increased. Moreover, incorporation of hexyl chains in the pi-conjugated spacer of these double anchoring dyes can efficiently suppress dye aggregation and reduce charge recombination. The conduction band electron lifetime of double anchors with hexyl chains sensitizer was ~2.5-fold higher than the dye without hexyl chain in he pi-conhugated spacer.
Molecular structure of the HL4 sensitizer.
O'Regan, B.; Gräzel, M. A low-cost, high-efficiency dolar cell based on dye-sensitized colloidal TiO2 films. Nature 1991, 353, 737-740 Abbotto, A.; Manfredi, N.; Marinzi, C.; Angelis, F. De; Mosconi, E.; Yum, J.-H.; Xianxi, Z.; Nazeeruddin,M. K.; Gräzel, M. Di-branched di-anchoring organic dyes for dye-sensitized solar cells. Energy Environ. Sci. 2009, 2, 1094-1101
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