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%）.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
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)
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
electrostatic adsorption
gold sol
all-nanoparticle self-assembly
dye-sensitized solar cell
blocking layer
