Interface Engineering of Crosslinkable Ruthenium Complex with Its Ligand Crosslinker and Cations to Enhance the Performance of Solid-State Dye Sensitized Solar Cells
Date Issued
2015
Date
2015
Author(s)
Lo, Wen-Fu
Abstract
In this study the crosslinkable ruthenium complex with styryl groups, denoted as RuS, was synthesized and characterized and applied to solid-state dye sensitized solar cell. The resulting open circuit voltage (Voc) and short circuit current (Jsc) were substantially enhanced compared to N3 dye, but efficiency was only 1.24% due to large interface resistence, leading to lower filled factor. After optimizing the thickness of titanium oxide to 1.7µm, the efficiency was slightly increased to 1.49%. To improve the interface, 4,4’-Bis((4-vinylbenzyloxy)methyl)-2,2''-bipyridine (BVP) ligand was introduced to crosslink with RuS. The crosslinked dye which attached on titanium oxide was more sustainable according to the desorption test. The efficiency rose to 2.12% with enhancement of all the photovoltaic properteis. Then the compounds which consist of Li+ and EMI+ were adsorbed onto the BVP-crosslinked RuS. The efficiency increased to 2.55% as LiTFSI was adsorbed. Not only Voc and Jsc increased, but the interfacial resistence in light condition dramatically decreased. Next, magnesium benzonate and calcium benzonate were individually adsorbed onto the BVP-crosslinked RuS. Both of them could increase the device efficiency, especially for magnesium benzonate. The efficiency was up to 2.66. It is owing to the interface resistence drastically decreased compared to the unadsorbed device. After that, magnesium, calcium and barium acetylacetonate salts were individually adsorbed onto the BVP-crosslinked RuS. By using the optimized amounts of magnesium acetylacetonate, efficiency raised to 2.82%. Compared to magnesium benzonate, the interface resistence with magnesium acetylacetonate was even smaller. Finally, the PL spectra showed that the adsorbed ion could acclerate dye regenegation in view of the decreased PL intensity of dye. IR spectra also showed that the carboxylate signal of RuS became red shift and bpyridine signal enhanced. This results indicated that the ions indeed had the strong interactions with BVP-crosslinked RuS and improved the compatibility between RuS and solid-state electrolyte.
Subjects
dye sensitized solar cell
crosslinkable ruthenium complex
ion absorption
SDGs
Type
thesis
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