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篇目详细内容 |
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【篇名】 |
Electron transportation and optical properties of micro-structure TiO2 films: applied in dye-sensitized solar cells |
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【刊名】 |
Frontiers of Optoelectronics in China |
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【刊名缩写】 |
Front. Optoelectron. China |
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【ISSN】 |
1674-4128 |
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【EISSN】 |
1674-4594 |
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【DOI】 |
10.1007/s12200-011-0202-5 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2011 |
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【卷期】 |
4
卷1期 |
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【页码】 |
72-79
页,共
8
页 |
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【作者】 |
Shuangying XU;
Linhua HU;
Jiang SHENG;
Dongxing KOU;
Huajun TIAN;
Songyuan DAI;
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【关键词】 |
micro-structure; porosity; optical property; electron transport; dye-sensitized solar cell (DSSC) |
【摘要】 |
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Micro-structure of TiO2 films in dye-sensitized solar cells (DSSCs) can affect light absorption and electron transportation that impact on the characteristics of current-voltage (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 short-circuit current density (Jsc) of 16.81？mA·cm？2 was obtained when the ratio of Ec-S was 10∶5. BET results 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 intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) implied that the electron transport time (τd) 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 in TiO2 film increased with its porosity, which revealed that the transportation of redox mediators in the electrolyte was speeded up. |
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