染料敏化TiO2太阳能电池薄膜电极的研制
文献类型：学位论文
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| 作者 | 王彦明 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 广州能源研究所 |
| 导师 | 李新军 |
| 关键词 | TiO2薄膜 Pt分布形式 DSCs 载流子分离 内建电势 |
| 其他题名 | The preparation and research of TiO2 film electrodes of Dye-sensitized Nanocrystalline solar Cells |
| 中文摘要 | The Dye-sensitized Nanocrystalline Solar Cells(DSCs) has obtained a great deal of attention and made great progress for a decade years because of its low cost, high energy conversion, simple productive technics, and other advantages. But in fact there are so many relative factors effecting on the capacities of DSCs need to be improved, and the factors can be listed as follows: packing technics, energy conversion, big scales and so on. It is no doubt that the direct and effective method to reduce the cost of DSCs is to increase the DSCs` energy conversion. There are also many factors those restrict the DSCs` energy coversion, including the absorption efficiency of dyes, the transfers of electrons through the TiO2 film, the reactive speed of redox reaction in the electrolyte between I- and I3-, et al. and we mainly research how the transfers of electrons through the TiO2 film effects the energy conversion of DSCs in the paper. At first, TiO2 thin films with Pt distributing in bottom layer or uniformly were prepared by sol-gel method through alternate dip-coating process. The photoelectrochemical behaviors of the films were measured by a three-electrode system, and the dye-sensitized solar cells (DSCs) with these films as anodes were assembled to investigate the photoelectric conversion capacities. The results show that the photocurrent of the TiO2 film with Pt distributing in bottom layer is higher than the pure TiO2 film and more enlarged by ethanol addition into the electrolyte as holes’ capture agent. The above phenomena can be explained based on the separation of photogenerated carriers and photoholes’accumulation in the surface layer. Due to photoholes accumulating in the surface, the excited electrons can transfer to TiO2 thin film more easily. The short-circuit Isc and the open-potential Voc are increased obviously. Secondly, it must be pointed that the photoelectrical signals of above DSCs are very small, because the TiO2 films are so plat and thin that they can not absorb more quantities of dye. For the purpose of increasing the energy conversion of DSCs, we used the TiO2 powders purchased from a semiconductor factory to prepare a kind of thick and porous TiO2 films by the blading method, and we assembled DSCs using the prepared TiO2 thick films. Moreover, we improved the structures of the TiO2 thick films, which we prior to prepared the thin films with a certain layers by dip-coating method between FTO and TiO2 thick films, and the thin films include TiO2 and Pt-TiO2 thin films with a certain layers. The photoelectrical signals are measured by a three-electrode system, and the irradiation intensity of the light source is 41mW/cm2. In contrast to the unimproved TiO2 thick film, the improved TiO2 thick films reduce a small quantity of open-potential，but it increase the short-current more obviously. Surprisingly, we find that there is a reverse dark potential appeared while DSCs being measured in the dark, if the TiO2 thick films contact with FTO directly. Finally, we use the work principles of DSCs, internal potential in the interface of FTO/TiO2 film and PN junction to complain the transfers mechanism of electrons through TiO2 film, and we also complain how the dark potential form and how to reduce or eliminate the dark potential. |
| 语种 | 中文 |
| 公开日期 | 2011-07-10 ; 2011-07-15 |
| 页码 | 67 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/4013]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 王彦明. 染料敏化TiO2太阳能电池薄膜电极的研制, The preparation and research of TiO2 film electrodes of Dye-sensitized Nanocrystalline solar Cells[D]. 广州能源研究所. 中国科学院广州能源研究所. 2007. |
入库方式： OAI收割
来源：广州能源研究所
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