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Efficiency Enhancement of Dye-Sensitized Solar Cells: Using Salt CuI as an Additive in an Ionic Liquid 下载免费PDF全文
Energy conversion efficiency of the dye-sensitized solar cell is improved from 3.5% to 4.5% by adding a small amount of CuI into an ionic liquid electrolyte. It is found that other copper-I salts, for example, CuBr, have the same effect for the dye-sensitized solar cell. Experimental results show that no Cu^2+ ions exist in this electrolyte. It is suggested that this improvement is caused by the adsorption of Cu^+ onto the TiO2 porous film. 相似文献
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TiO_2 composite electron transport layers for planar perovskite solar cells by mixed spray pyrolysis with precursor solution incorporating TiO_2 nanoparticles 下载免费PDF全文
Perovskite solar cells with planar structure are attractive for their simplified device structure and reduced hysteresis effect. Compared to conventional mesoporous devices, TiO_2 porous scaffold layers are removed in planar devices. Then,compact TiO_2 electron transport layers take the functions of extracting electrons, transporting electrons, and blocking holes.Therefore, the properties of these compact TiO_2 layers are important for the performance of solar cells. In this work, we develop a mixed spray pyrolysis method for producing compact TiO_2 layers by incorporating TiO_2 nanoparticles with different size into the precursor solutions. For the optimized nanoparticle size of 60 nm, a power conversion efficiency of 16.7% is achieved, which is obviously higher than that of devices without incorporated nanoparticles(9.9%). Further investigation reveals that the incorporation of nanoparticles can remarkably improve the charge extraction and recombination processes. 相似文献
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采用同步辐射能量色散X射线衍射技术和金刚石对顶砧高压装置,对ZnS:Eu纳米晶进行了原位高压X光衍射实验.最高压力为30.8Pa.当压力为11.5GPa时,ZnS:Eu发生了一次从纤锌矿到闪锌矿的结构相变.在压力为16.0GPa时,又发生了明显的结构相变,相变后的结构为岩盐矿,其相变压力较体材料高.得到了Birch-Murnaghan状态方程、ZnS:Eu纳米晶的体模量和压力导数.ZnS:Eu纳米晶的体模量高于体材料的值,表明纳米材料较体材料的硬度高. 相似文献
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Recombination Reduction in Dye-Sensitized Solar Cells by Screen-Printed TiO2 Underlayers 总被引:1,自引:0,他引:1 下载免费PDF全文
In dye-sensitized solar cells (DSSCs), the TiO2 underlayer can block the electron recombination at the FTO (fluorine doped SnO2) glass/electrolyte interface. This underlayer was traditionally prepared by spray-pyrolysis or spin coating. In this study, we develop an alternative method based on screen-printing. The quality of the screen-printed underlayers is characterized by SEM, XPS and the photoelectrochemistry measurements. The prepared underlayers are smooth and effective. The screen-printing technique is cheap and easy to handle and can produce films with different patterns. These advantages will facilitate applications of the screen-printed underlayer. 相似文献
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利用具有钙钛矿结构的有机-无机杂化卤化物制备的太阳能电池, 由于具有溶液可加工性和高光电转换效率, 受到了广泛关注. 在目前报道的最高光电转换效率的器件中, 采用了CH3NH3PbI(3-x)Clx碘氯混合钙钛矿作为吸光层, 据报道在这种材料中光电子的扩散长度可以超过1 μm. 本文综述了在CH3NH3PbI(3-x)Clx方面现有的研究工作, 指出了薄膜制备条件的重要性, 并研究了CH3NH3I在PbCl2/CH3NH3I热解法制备CH3NH3PbI(3-x)Clx吸光层中的作用. 扫描电子显微镜研究表明CH3NH3I加入量为PbCl2的2倍到2.75倍时, CH3NH3I加入量的增加可以提高CH3NH3PbI(3-x)Clx吸光层的覆盖度和结晶度, CH3NH3I加入量进一步增加到3倍时, 形貌变化不大. X射线光电子能谱的数据证实了CH3NH3I加入量对覆盖度的影响, 并显示在CH3NH3I加入量大于PbCl2的2.5倍以后, CH3NH3PbI(3-x)Clx中氯的掺入量急剧下降. 光电测试表明器件性能随CH3NH3I加入量增加而增加, 在CH3NH3I/PbCl2为3/1时达到最高, 加入量略小于3/1对性能影响不大. 相似文献
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