交联孔隙结构TiO_2-PEDOT:PSS纳米复合薄膜的制备及作为对电极的应用  

Synthesis of TiO_2-PEDOT:PSS Nanocomposite Film and Its Application for Dye-Sensitized Solar Cells as Counter Electrode

作　　者：徐顺建[1] 黄勇[2] 钟炜[1] 肖宗湖[1] 罗永平[1] 欧惠[1] 

机构地区：[1]新余学院新余新能源研究所,江西新余338004 [2]新余学院数学与计算机科学学院,江西新余338004

出　　处：《光学学报》2014年第9期326-332,共7页Acta Optica Sinica

基　　金：国家自然科学基金(51162025;51263021);江西省青年科学家培养对象计划(20133BCB23035);江西省高等学校科技落地计划(KJLD13100);江西省教育厅资助科研项目(GJJ13776)

摘　　要：以TiO2为多孔模板并以聚3,4-亚乙二氧基噻吩-聚苯乙烯磺酸(PEDOT:PSS)为催化材料合成了具有交联孔隙结构的TiO2-PEDOT:PSS纳米复合薄膜(TPNF),并将其作为对电极应用于染料敏化太阳电池(DSC)。首先将TiO2纳米颗粒沉积在导电的掺杂氟的SnO2透明玻璃(FTO)上形成骨架和孔隙均在纳米级别的模板,随后将PEDOT:PSS水溶液附着在模板的骨架表面,最终经热处理获得TPNF。通过优化模板结构和旋涂转速,获得了催化活性优异的TPNF,组装后DSC的填充因子和转换效率分别达到0.528和4.57%,均远高于纯PEDOT:PSS薄膜组装的器件的填充因子(0.297)和转换效率(1.98%)。改善的光电性能归功于TPNF具有优异的协同效应:导电的TiO2骨架为电子迁移提供了快速路径,同时涂覆在骨架表面的PEDOT:PSS通过扩展表面积为还原电解质提供了更多的催化活性点。Nanocomposite films with interconnected pores are fabricated using TiO2 as porous template with poly 3, 4-ethylenedioxythiophene：polystyrene sulfonate （PEDOT：PSS） as catalyst, and then are developed as alternative counter electrodes for dye-sensitized solar cells （DSC）. The porous templates are prepared by depositing the TiO2 nanoparticles on the conductive SnO2 transpanent glass doping fluorine （FTO）, followed by annealing. The nanocomposite films are then completed by spin coating of the commercial PEDOT： PSS aqueous solution into the template. By optimizing the template structures and the spin coating rates, the nanocomposite film with excellent catalytic activity for the tri-iodide reduction is obtained. When employing this nanocomposite film as the counter electrode for the DSC, the optimum fill factor and efficiency respectively reach to 0. 528 and 4.57 %, which are greatly higher than those of the cells with the pure PEDOT.＇PSS film as the counter electrode. The fill factor and efficiency of the latter are 0. 297 and 1.98 %, respectively. The improved photovoltaic performances are attributed to the excellent synergistic effects of the nanocomposite film. The conducting TiO2 skeleton provides high-speed conductive paths for the electrons transportation, and the PEDOT： PSS adhered on the skeleton engenders large surface area provides more active sites for the tri-iodide reduction.

关 键 词：薄膜 光学器件 导电聚合物 纳米复合材料 对电极 太阳电池 

分 类 号：TM914[电气工程—电力电子与电力传动]