CdTe Quantum Dots-Sensitized TiO2 Nanotube Array Photoelectrodes
CdTe Quantum Dots-Sensitized TiO2 Nanotube Array Photoelectrodes
复制标题
CdTe 量子点敏化 TiO2 纳米管阵列光电极
DOI：
10.1021/jp810727n
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发表时间：
2009-05-07
影响因子：
3.7
通讯作者：
Peng, Lian-Mao
中科院分区：
文献类型：
--
作者：
Gao, Xian-Feng;Li, Hong-Bo;Peng, Lian-Mao
通过阳极氧化形成的TiO 2纳米管阵列薄膜在光电化学（PEC）器件中具有很高的电荷产生和收集效率。然而，TiO 2的宽带隙（3.2eV）限制了这些器件在可见光区的效率。在这项工作中，四种类型的预合成的不同尺寸的CdTe量子点（QDs）沉积到TiO 2纳米管作为敏化剂，并在PEC太阳能电池的性能进行了测量的CdTe量子点敏化的TiO 2纳米管阵列。结果发现，随着颗粒尺寸的减小，电子注入的驱动力增加，而可见光响应降低。在536 nm处具有吸收峰的量子点获得最大光电流。在AM 1.5 G照明下，实现了6 mA/cm 2的短路电流密度，与基于使用普通TiO 2纳米管膜的短路电流密度相比，其呈现出35倍的改善。
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/cm2 short circuit current density is achieved, which presents a 35 times improvement compared to that based on using a plain TiO2 nanotube film.