N719染料敏化BaTiO3@TiO2纳米复合电极的制备及性能研究  

Preparation and properties of BaTiO3@TiO2 nanocomposite electrode with N719 Dye sensitization

作　　者：邓佳奇 宋波[1] 解东梅 林原[2] DENG Jiaqi;SONG Bo;XIE Dongmei;LIN Yuan(School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing 100083, China;Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]中国科学院化学研究所,北京100190

出　　处：《功能材料》2020年第2期2176-2181,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51673204,61604058)

摘　　要：BaTiO3是非常常见的铁电材料,经常用于制备铁电光伏器件或与半导体器件相结合来优化光伏器件的光电性能。采用水热法合成了BaTiO3纳米颗粒,并在FTO玻璃上制备了BaTiO3纳米晶薄膜,通过TiCl4水溶液后处理的方法在BaTiO3纳米薄膜上形成不同厚度的TiO2层,利用XRD、SEM和TEM分别对BaTiO3@TiO2纳米复合薄膜的物相和形貌进行了表征。将此电极经N719染料敏化后作为染料敏化太阳能电池的光阳极,并进行了光电性能测试。研究结果表明,水热法制备的BaTiO3薄膜晶型为四方相,呈球形多孔,平均粒径约50 nm;经过TiCl4后处理,在BaTiO3薄膜表面形成了锐钛矿相的TiO2颗粒。180℃下水热合成的BaTiO3纳米颗粒经过4次TiCl4后处理制备成的染料敏化太阳能电池取得了最优性能,其光电流密度9.78 mA cm-2,开路电压765 mV,填充因子76.1%和光电转换效率5.69%。BaTiO3 is a very common ferroelectric material,which is often used to prepare ferroelectric photovoltaic devices or combine with semiconductor devices to optimize the photoelectric performance of photovoltaic devices.BaTiO3 nanoparticles were synthesized by hydrothermal method,and BaTiO3 nanocrystalline films were prepared on FTO glass.Then different thicknesses of TiO2 layers were formed on BaTiO3 nanocrystalline films by TiCl4 aqueous solution post-treatment.The physical phase and morphology of BaTiO3@TiO2 nanocrystalline films were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).The electrode was sensitized with N719 dye and used as a photoanode of dye sensitized solar cells,and photoelectric properties were tested.The result shows that the BaTiO3 film was spherical porous and tetragonal structure with the average particle size of about 50 nm.TiO2 particles of anatase phase were formed on the surface of BaTiO3 thin film after TiCl4 post-treatment.The dye sensitized solar cell prepared by hydrothermal synthesis of BaTiO3 nanoparticles at 180℃and treated by 4 times of post-treatment achieved the optimal performance,with the photocurrent density,open circuit voltage,fill factor and power conversion efficiency of 9.78 mA/cm^2,765 mV,76.1%and 5.69%,respectively.

关 键 词：BaTiO3薄膜 BaTiO3@TiO2纳米复合电极 TiCl4后处理 N719染料 染料敏化太阳能电池 

分 类 号：TM914.4[电气工程—电力电子与电力传动]