Details

Autor(en) / Beteiligte

• Gao, Xian-Feng
• Li, Hong-Bo
• Sun, Wen-Tao
• Chen, Qing
• Tang, Fang-Qiong
• Peng, Lian-Mao

Titel

CdTe Quantum Dots-Sensitized TiO2 Nanotube Array Photoelectrodes

Ist Teil von

• Journal of physical chemistry. C, 2009-05, Vol.113 (18), p.7531-7535

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.