Electron transportation and optical properties of microstructure TiO2 films: applied in dye-sensitized solar cells |
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Authors: | Shuangying XU Linhua HU Jiang SHENG Dongxing KOU Huajun TIAN Songyuan DAI |
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Affiliation: | Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract: | Micro-structure of TiO2 films in dye-sensitized solar cells (DSSCs) can affect light absorption and electron transportation that impact on the characteristics of currentvoltage (J-V). In this paper, films with different surface area, pore size and porosity were obtained by adding different ratio of ethyl cellulose (Ec-S) to pastes, and a photo-electric conversion efficiency (η) of 7.55% with a showed that film with this optimum ratio had the most suitable pore size and surface area for good properties of photovoltaic, which had a low reflectivity and high transmission rate, and the efficiency of light utilization was improved. Moreover, measurements by intensitymodulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS)implied that the electron transport time (rd) increased as the content of Ec-S increased, which was related to the larger surface area. Results of steady-state cyclic voltammetry indicated that diffusion-limited current density (Jlim) of I3-;in TiO2 film increased with its porosity, which revealed that the transportation ofredox mediators in the electrolyte was speeded up. |
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Keywords: | micro-structure porosity optical property electron transport dye-sensitized solar cell (DSSC) |
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