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Citation: LI Kui-Ying, LIU Tong, ZHOU Bing-Jing, WEI Sai-Ling, YANG Wei-Yong. Transient Photovoltaic and Surface Photoacoustic Characteristics of Mesoporous Crystalline La-doped TiO₂ Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2010, 26(02): 403-408. doi: 10.3866/PKU.WHXB20100213 shu

Transient Photovoltaic and Surface Photoacoustic Characteristics of Mesoporous Crystalline La-doped TiO₂ Nanoparticles

1.
National Laboratory of Metastable Materials Manufacture Technology&Science, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China

Received Date: 2 July 2009
Available Online: 23 December 2009

Transient photovoltaic and surface photoacoustic techniques were used to investigate the separation and recombination processes of photogenerated charge carriers and the mechanism of energy conversion for mesoporous La-doped nano-TiO2. Results indicate that two defect states with different photovoltage characteristics have a short diffusion distance and a fast recombination velocity for the electron hole pair; and that doped lanthanum increases the contribution of bulk defects to the photovoltaic effect, but inhibits the main bandgap charge separation to a certain extent. Additionally, we show that both the mechanism of separation and recombination of the main bandgap electron hole pair and the intensity of the lattice vibration resulting from the non-radioactive transition are highly dependent on the type of template. These experimental results confirm that an obvious energy balance relationship exists between transient photovoltaics and surface photoacoustic phenomena.
- TiO2,
- Mesoporous nanocrystalline,
- Template,
- La-doped,
- Transient photovoltaic spectroscopy,
- Surface photoacoustic spectroscopy
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沈阳化工大学材料科学与工程学院沈阳 110142

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Transient Photovoltaic and Surface Photoacoustic Characteristics of Mesoporous Crystalline La-doped TiO2 Nanoparticles

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通讯作者: 陈斌, bchen63@163.com

Transient Photovoltaic and Surface Photoacoustic Characteristics of Mesoporous Crystalline La-doped TiO₂ Nanoparticles