| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 102 === Increasing energy demands and the impact of global warming have been arisen huge need of renewable energy from environmentally benign resources in the past few decades. Conversion of solar energy into electricity via photovoltaic technologies provide the sustainable approaches to satisfy these issues. Both of dye-sensitized solar cells (DSSCs) and organic solar cells (OSCs) have been regarded as highly promising and cost-effective alternatives to the market dominated by silicon-based counterparts.
A donor-(π-conjugated spacer)-acceptor (D-π-A) system is the most widely adopted molecular architecture for organic dyes in DSSCs. The new dyes, BPDTA、BTTA, featuring two donor/acceptor chromophores aligned in a spiro-like con&;#64257;guration with two anchoring groups separated at a distance of 12.07 A (closely matching the distance between the adsorption sites of the anatase TiO2 surface) , a spiro-like configured central unit, and four n-heaxyl chains to diminish intermolecular interactions and suppress molecular aggregation were synthesized for efficient DSSCs with a high PCE of 6.86 % . As compared to the rod-shape of the mono-anchoring D-π-A analogue dye, the cross shape of the bi-anchoring D-π-A branched dyes are highly-efficienct sensitizers for DSSCs. Furthermore, these dyes have highly binding affinity and extinction coefficient, which are two required factors to develop high efficiency DSSCs.
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