Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In recent years, dye-sensitized solar cells (DSSCs) have emerged as one of the possible solutions for the global energy crisis. Among the various components of DSSCs, the sensitizer, which harvests solar energy and injects electrons in to the semiconductor layer, plays a crucial role in achieving high efficiency and durability of the cell. To date ruthenium(II) sensitizers exhibit high efficiencies (>11.5%), but they are not so suitable for roof-top/commercial applications mainly because of their limited harvesting capability, expensive ruthenium metal and low durability. In this work, a series of new push-pull N-phenylphenothiazine-based dyes featureing various π-spacer and double acceptors/anchors have been synthesized, characterized, and used as sensitizers for dye-sensitized solar cells. Their photovoltaic performances are characterized experimentally and the structure-performance relationship is explored with the aid of theoretical calculation. All the organic dyes show the D-D-π-A structural backbone, changing π-spacer can alter the molecular coplanarity of conjugated skeleton and the intramolecular charge transfer (ICT) that finally affects the electronic spectrol properties and the photovoltaic performances. Among them, sensitizers with 3-hexyl thiophene were beneficial for interfacial charge generation and transport. This is exemplified by the development of a novel, organic dye (PR8HCN2) exhibiting a power conversion efficiency of over 9%.
Figure. (a) I-V (b) IPCE curves of DSSC containing organic photosensitizers
Wei-I, H.; You-Ya, L.; Chih-Yu, H.; Hsien-Hsin, C.; Ting-Hui, L.; Wei-Siang, K.; Jiann T, L. High-Performance Dye-Sensitized Solar Cells Based on Phenothiazine Dyes Containing Double Anchors and Thiophene Spacers. Chem.Asian J. 2014, 9, 357-366.
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