Au修饰的全纳米颗粒自组装SnO_2/TiO_2薄膜及其DSSCs阻挡层应用  

Au Modified All-nanoparticle Self Assembly SnO_2/TiO_2 Thin Film and Its Application as the Dye-sensitized Solar Cells Blocking Layer

作　　者：胡晓青[1] 王宏志[1] 李耀刚[1] 张青红[1] 

机构地区：[1]东华大学纤维改性国家重点实验室,上海201620

出　　处：《硅酸盐通报》2015年第10期2803-2808,2821,共7页Bulletin of the Chinese Ceramic Society

基　　金：高等学校学科创新引智计划资助(111-2-04);高等学校博士学科点专项科研基金(20110075130001);教育部创新团队发展计划(IRT1221);上海市科委项目(15ZR1401200;13JC1400200)

摘　　要：采用硼氢化钠还原金盐溶液,制备了晶粒尺寸为5 nm的金溶胶,以静电吸附的方法将Au纳米晶均匀地沉积在FTO玻璃基全纳米颗粒组装的SnO2/TiO2薄膜内,用SEM、EDS、TEM、光电流密度等方法对金修饰的全纳米颗粒组装SnO2/TiO2薄膜(Au-SnO2/TiO2)进行了表征。金纳米晶修饰后,光电流密度较相同厚度的SnO2/TiO2薄膜提高了128.3%,更加有利于光生电子的迁移。将Au-SnO2/TiO2薄膜用作染料敏化太阳能电池(Dye-sensitized solar cells,DSSCs)的阻挡层后,发现复合薄膜有效地阻止了导电玻璃基底上光生电子与电解液中I-3的复合,提高了DSSCs的光电转换效率。不同厚度的Au-SnO2/TiO2阻挡层复合薄膜中,含6层Au-SnO2/TiO2复合薄膜阻挡层的DSSCs最终效率为7.12%,较常用的Ti Cl4稀溶液预处理FTO玻璃的工艺(6.06%)提高了17.5%。Au sols with an average crystallite size of 5 nm were prepared by reduction of Na4BH4 with gold slat solution,and then Au nanocrystals were deposited on the all-nanoparticle self-assembly SnO2/ TiO2 thin film on FTO glass substrate via an electrostatic adsorption route.The Au modified SnO2/ TiO2（ AuSnO2/ TiO2） thin films were characterized with SEM,EDS,TEM,and photocurrent-time curves,the photocurrent density of Au-SnO2/ TiO2 was increased up 128.3% compared to bare SnO2/ TiO2 thin film in a similar thickness,suggesting that SnO2/ TiO2 thin film with Au nanocrystals modifying is beneficial to photo-generated electron transport.The Au-SnO2/ TiO2 films were used as the dye-sensitized solar cells（ DSSCs） blocking layer,and in the presence of Au-SnO2/ TiO2 thin film was found efficiently inhibited the recombination of photo-generated electron on the conductive substrate with I-3in the electrolyte solution,thus photoelectric conversion efficiency of DSSCs was improved.Among DSSCs with Au-SnO2/TiO2 thin films in varying layers,the DSSC with 6 layer Au-SnO2/ TiO2 thin film as the blocking layer had an η as high as of 7.12% and with an increment of 17.5%,was much higher than that of the DSSCusing the common Ti Cl4 solution treatment（ 6.06%）.

关 键 词：金溶胶 全纳米颗粒自组装 染料敏化太阳能电池 阻挡层 

分 类 号：O646[理学—物理化学]