一步法合成微纳结构TiO_2及在染料敏化太阳电池中的应用  

Symbiosis of TiO_2 Microspheres and Nanoparticles Via a One-Pot Process and Its Application in Dye-Sensitized Solar Cell

作　　者：戴松元[1,2] 李兆乾[2] 桃李[2] 胡林华[2] 

机构地区：[1]华北电力大学可再生能源学院北京市新型薄膜太阳电池重点实验室,北京102206 [2]中国科学院应用技术研究所中国科学院新型薄膜太阳电池重点实验室,合肥230031

出　　处：《安徽师范大学学报（自然科学版）》2015年第4期307-315,共9页Journal of Anhui Normal University(Natural Science)

基　　金：国家重点基础研究发展计划(2011CBA00700);国家自然科学基金(21173228和61204075);中国博士后科学基金(2014M551825)

摘　　要：TiO2纳米颗粒具有较高的比表面积及吸附性能,使得其在染料敏化太阳电池中的应用及效率取得了突出的进展.近年来,TiO2微米球由于具有较大的比表面积、对可见光的散射作用强,以及特殊的微纳米结构等特点,倍受人们的关注.因此,为了获得较高的光电转化效率,充分利用各维度微纳米材料的优点,制备复合维度的光阳极结构薄膜是目前研究的热点.在本研究中,我们采用一步法直接合成了TiO2微米球与纳米颗粒共生纳米材料,该共生材料具有较大的比表面积、优良的光散射作用.将其作为光阳极材料应用于染料敏化太阳电池中,与纯微米球及纳米颗粒相比,基于该共生纳米材料制备的光阳极薄膜的染料吸附量大、电子寿命长,有效地提高了电池的短路电流密度,在相同的多孔薄膜厚度为7.2μm时,得到了8.15%的光电转化效率,优于纯微米球的7.60%及纳米颗粒的6.83%.最后,通过加入一层纳米颗粒(4.8μm)进行薄膜结构优化及Ti Cl4处理,基于该共生微纳米结构的太阳电池获得了10.82%的高光电转化效率.TiO2 nanoparticles have been successfully applied to photoanode and exhibited great performance in dyesensitized solar cells owing to its high surface area and dye adsorption property. TiO2 microspheres are of great interest due to their characteristics such as high surface area,excellent light scattering effect and special micro /nano-structure. In recent years,in order to further optimize the photoanode film structure and obtain higher photoelectric conversion efficiency,fabricating of complex dimensional TiO2 micro / nano-materials based photoanode is an efficient way and has been a current research focus. In this work,TiO2 microspheres and nanoparticles were symbiotic synthesized via a facie solvothermal method by addition of diethylenetriamine,and applied in dyesensitized solar cells( DSCs). The as-obtained symbiosis TiO2 material possesses high surface area and superior light scattering effect. More importantly, compared with pure TiO2 microspheres and nanoparticles based photoanode,the symbiosis product based photoanode shows higher dye loading and longer electron lifetime.Consequently,a high photocurrent density and power conversion efficiency( 8. 15%) were obtained,which is higher than those of pure TiO2microspheres( 7. 6%) and nanoparticles( 6. 83%) based DSCs. Finally,by adding a TiO2 nanoparticle underlayer( 4. 8μm) and Ti Cl4 treatment,the photoanode film structure was optimized and a high PCE value up to 10. 82% was obtained in the symbiosis materials based DSC.

关 键 词：染料敏化 微米球 纳米颗粒 高光电转换效率 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]