CdTe Quantum Dots-Sensitized TiO2 Nanotube Array Photoelectrodes

被引：308

作者：

Gao, Xian-Feng ^{[1
,2
]}

Li, Hong-Bo ^{[3
]}

Sun, Wen-Tao ^{[1
,2
]}

Chen, Qing ^{[1
,2
]}

Tang, Fang-Qiong ^{[3
]}

Peng, Lian-Mao ^{[1
,2
]}

机构：

[1] Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China

[2] Peking Univ, Dept Elect, Beijing 100871, Peoples R China

[3] Chinese Acad Sci, Lab Controllable Preparat & Applicat Nanomat, Tech Inst Phys & Chem, Beijing 10080, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 18期

基金：

美国国家科学基金会;

关键词：

SOLAR-CELLS; ELECTRODES; NANOCRYSTALS; WATER; SIZE; CDS; PHOTOSENSITIZATION; SEMICONDUCTOR; NANOPARTICLES; NANOWIRES;

D O I：

10.1021/jp810727n

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：

TiO2 nanotube array films, formed by anodic oxidation, have been shown to yield high efficiency of charge generation and collection in photoelectrochemical (PEC) devices. However, the wide band gap (3.2 eV) of TiO2 limits the efficiency of these devices in the visible region. In this work, four types of presynthesized CdTe quantum dots (QDs) of different sizes were deposited into the TiO2 nanotubes to serve as the sensitizers, and the performance of the CdTe QD-sensitized TiO2 nanotube arrays was measured in a PEC solar cell. It is found that, with decreasing particle size, the driving force for electron injection increases while the visible light response decreases. Maximum photocurrent was obtained for the QDs that have an absorption peak at 536 nm. Under AM 1.5 G illuminations, a 6 mA/cm(2) Short circuit current density is achieved, which presents a 35 times improvement compared to that based on using a plain TiO2 nanotube film.

引用

页码：7531 / 7535

页数：5