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1.
By means of first-principles calculations based on the ab initio pseudopotential and plane wave basis, we present self-consistent molecular dynamic calculations to determine a clean TiO2 crystal (001) surface geometry and surface electronic states structure. All calculations were performed for both rutile and anatase phases. Using a total energy minimization strategy, we acquired the general inward relaxations. The s-like surface states just above the lower valence band at (001) surfaces both in the rutile and anatase phases are found. The band bending effect occurs both in rutile and anatase (001) surfaces. It reduces the band gap by ac. 0.4 eV in rutile and ac. 0.8 eV in anatase, elevating the Fermi energy levels. Besides the band bending of the valence band, surface states also lie near the bottom of the conduction band. The lower surface energy of anatase makes nanocrystalline TiO2 is often in the anatase phase below a critical size.Our results are in good agreement with the previous work and experimental data.  相似文献   
2.
小面积染料敏化纳米薄膜太阳电池的优化研究   总被引:2,自引:0,他引:2  
论述了对小面积染料敏化纳米薄膜太阳电池各个组成部分优化实验的研究,主要包括纳米TiO2多孔薄膜、染料光敏化剂、电解质、反电极及其它工艺的优化选择。通过对电池各种参数的优化和实验,获得了8.73%的光电转换效率。实验结果表明,小面积电池的实验是研究染料敏化纳米薄膜太阳电池光伏性能的一种极好的途经,将为保证大面积DSCs的光伏性能和将来的产业化打下良好的基础。  相似文献   
3.
The dye-sensitized TiO2 complex films were prepared by the dye coat onto TiO2 surfaces,and the sensitizing mechanism and adsorption properties of the dye-sensitized TiO2 complex films were inverstigated.The influence of the application conditions of dye adsorbed on TiO2 films on the amount of dye adsorption was discussed.Experimental results show that the concentration,the temperature of dye solutions and the dipping time of TiO2 films in the dye solutions have a significant influence on the amount of dye adsorption.Cell test indicates that the conversion efficiency of light to electricity increases with the amount of dye adsorption.  相似文献   
4.
在利用溶胶-凝胶法制备纳米TiO2过程中,用热处理方法控制纳米TiO2的形貌和晶型,取得较好的效果,并通过太阳电池的测试实验得到证实。  相似文献   
5.
Sol-Gel法制备纳米TiO2过程中水解pH值的影响及其性能表征   总被引:18,自引:2,他引:16  
王瑞斌  戴松元  王孔嘉 《功能材料》2002,33(3):296-297,302
采用钛酸四异丙酯[Ti(i-OC3H7)4]水解法制备纳米TiO2粉体,水解过程中有很多参数对纳米TiO2的特征产生影响,通过控制制备过程中的水解pH值,可以得到不同粒径和不同晶型的纳米TiO2粉体,本文主要探讨了纳米TiO2晶型转变的条件和晶粒度Dhkl随pH值变化的趋势,并利用XRD,TEM对粉体颗粒的形貌,大小,物相组成进行分析,XRD分析研究表明,纳米的A→R相变和水解pH值密切相关。  相似文献   
6.
In order to improve the performance of the dye-sensitized solar cells based on ZnO films, ZnO nanoparticles of different sizes were prepared by two methods. Some surfactants were added into the particles to form three types of ZnO pastes. Electrodes of various thickness applied to dye-sensitized solar cell were prepared starting from each of those pastes by the screen-printing method. The performance of dye-sensitized solar cells was optimized via both the selected particle size and film thickness. The reason of the inefficiency was explained by the infrared and ultraviolet- visible absorption spectra.  相似文献   
7.
Bipyridyl ruthenium dye N3 and N719 was synthesized, purified by the gel chromatogram method and characterized by the proton NMR and UV-Vis spectra. After the purification most of the impurities that decreased the photoelectrochemical properties were removed and the open-circuit voltage (Voc), short-circuit photocurrent density (Jsc) and overall photo-electric conversion efficiency (η) of the dye-sensitized solar cells (DSCs) increased dramatically. The standard curve of absorbance vs. concentration of N3 and N719 dye was achieved by using UV-Vis quantitative analytic spectrophotometry. This method was employed to determine the concentration of the dye solution after coating of TiO2 films. The linear concentration range of absorbance vs. concentration of N719 was between 6.25×10^-6 mol·L^-1 and 1×10^-4 mol·L^-1 with the molar extinction coefficient (ε) 1.58 ×10^4 L mol·L^-1·cm^-1 at a wavelength of 533 - 531 nm and 1.50 × 10^4 Lmol·L^-1·cm^-1 at a wavelength of 393 - 384 nm , accordingly. The linear concentration range of the N3 dye was 6.25 × 10^-6mol·L^-1 to 1.5× 10^-4 mol·L^-1 with ε of 1.47 × 10^4 L mol·L^-1· cm^-1 at a wavelength of 538 - 535 nm and 1.48 × 10^4 L ·mol·L^-1·cm^-1 at a wavelength of 399 - 393 nm.  相似文献   
8.
大面积染料敏化纳米薄膜太阳电池的研制   总被引:8,自引:2,他引:6  
介绍我所在大面积染料敏化纳米薄膜太阳电池的详细设计思路和制作方法,并比较内部串联DSCs和内部并联DSCs在实用化制作和测试中的性能差异。介绍我所在大面积染料敏化纳米薄膜太阳电池的最新研究成果。  相似文献   
9.
主要从染料敏化纳米薄膜太阳电池(以下简介DSCs)的工作原理出发,分别对染料敏化纳米薄膜太阳电池中纳米多孔TiO2薄膜的最新研究和实验进行了讨论,并指出了纳米多孔TiO2薄膜研究中所存在的、影响电池效率的一些主要问题,以及可能的解决方法。  相似文献   
10.
染料敏化纳米薄膜太阳电池最新研究和产业化前景   总被引:6,自引:4,他引:2  
对染料敏化纳米薄膜太阳电池目前的研究和发展现状进行了总结和评述,并对其工业化前景进行了探讨。介绍了我国在染料敏化纳米薄膜太阳电池产业化研究中的最新进展和成果。  相似文献   
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