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
介孔掺镧纳米晶TiO2瞬态光伏与表面光声特性
English
Transient Photovoltaic and Surface Photoacoustic Characteristics of Mesoporous Crystalline La-doped TiO2 Nanoparticles
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.
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