Photoelectrochemistry of composite semiconductor thin films. Photosensitization of SnO2/CdS coupled nanocrystallites with a ruthenium polypyridyl complex

被引:152
作者
Nasr, C
Hotchandani, S
Kim, WY
Schmehl, RH
Kamat, PV
机构
[1] UNIV NOTRE DAME,RADIAT LAB,NOTRE DAME,IN 46556
[2] TULANE UNIV,DEPT CHEM,NEW ORLEANS,LA 70118
[3] UNIV QUEBEC,GRP RECH ENERGIE & INFORMAT BIOMOL,TROIS RIVIERES,PQ G9A 5H7,CANADA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 38期
关键词
D O I
10.1021/jp970833k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The charge injection from an excited Ru(II) complex (viz., (Ru(bpy)(2)(L))(2+), where L = 4-(2,2'-bipyrid-4-yl)phenyl diphosphonate) into SnO2 and SnO2/CdS films is investigated to elucidate the beneficial effect of composite semiconductor systems. The electrons injected from excited Ru(II) into CdS are transferred quickly into SnO2 nanoclusters, thus promoting the charge separation. Photoelectrochemical measurements suggest improved photon to photocurrent charge carrier generation efficiency in the SnO2/CdS composite system, The formation of the oxidation produce, Ru(III), and the recovery of the sensitizer are investigated using transient absorption spectroscopy, The rate constant for the back electron transfer in the SnO2/CdS/Ru(II) composite system is slower by a factor of 2-3 than the one observed in the SnO2/Ru(II) system. The beneficial aspects of composite semiconductor systems in photochemical solar cells are presented.
引用
收藏
页码:7480 / 7487
页数:8
相关论文
共 72 条