| Summary: | 碩士 === 國立中興大學 === 化學系所 === 101 === Dye-sensitized solar cells (DSSC) have recently received great attention because of low production cost. Nature has proved that chlorophylls can be the best energy harvesters. In 2011, YD2-o-C8 co-sensitized with Y123 has achieved the PCE of 12.3%. We designed and synthesized the dyes (20)、(21)、(22) base on YD2-o-C8 to reduce dye aggregation and lower charge recombination, we have modified octyloxy group to 2-butyloctyloxy group. Owing to the deficiency of acetylenic link, the PCE of these modified dyes is lower than YD2-o-C8. In addition, the modified [A3B] asymmetric dyes (25) and (28) have a dip near 500 nm in the UV-vis absorption spectrum. To improve the light-harvesting efficiency, porphyrins were co-sensitized with perylene, which show strong absorption
band in the 450~550 nm region.
For organic dye, we synthesized a series of perylene-fused and perylene-anhydride dyes. In perylene-fused system, dye (47) with long alkyl chain exhibited an efficiency of 5.85%. In perylene-anhydride system, we modified and synthesized compound (56) with long alkyl donor chain
based on P1. The compound (56) achieved an efficiency of 4.55%.
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