Gel-State Dye-Sensitized Solar Cells by Using Organic Dye Cocktails

• Main Authors: Ya-Hsiu Lin, 林亞秀
• Other Authors: Yu-Min Yang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/24642035707181187738

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 97 === Although classical dye-sensitized solar cells (DSSCs) with polypyridyl complexes of ruthenium as sensitizers may reach relatively high overall efficiencies, the high price is a big problem. Furthermore, solvent evaporation and leakage of the liquid electrolyte limit the progress in flexible DSSCs. In this study, dye cocktails of commercial and cheap organic dyes were used with the aim to improve the overall efficiency of DSSCs with liquid electrolyte. Moreover, gel-state DSSCs were also developed by using the same dye cocktails. Following our previous study of four binary systems, five organic dyes D149 (D)、Mercurochrome (M)、Eosin Y (E)、Rose bengal (R)、Coumarin 343 (C) were used and formed three additional binary systems(D/E、 D/R 、D/C ) in this work to prove the possibility of overall efficiency enhancement by using dye cocktails approach and the defects-filling mechanism. The experimental results showed that minute amounts of dyes, which are the ones with less adsorption ability and lower efficiency, in binary systems (M/R, M/E, D/M, D/R, D/E) can enhance the overall efficiency of DSSCs. D/M and D/R dye cocktails were futher applied in gel-state DSSCs by using 10% poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as gelator and 10% TiO2 nanoparticles as fillers. The experimental results revealed that overall efficiency as high as that with liquid electrolyte can be realized by the gel-state DSSCs. And longer lifetime can be achieved. Finally, the defects-filling mechanism in enhancing the overall efficiency was confirmed again by conducting the dark current analyses on the gel-state DSSCs.