物理化学学报 >> 1998, Vol. 14 >> Issue (04): 309-314.doi: 10.3866/PKU.WHXB19980405

研究论文 上一篇    下一篇

TiO2纳米晶多孔膜的电荷传输特性

郝彦忠, 杨迈之, 余赤贞, 蔡生民   

  1. 北京大学化学与分子工程学院，北京 100871
  • 收稿日期:1997-07-10 修回日期:1997-10-15 发布日期:1998-04-15
  • 通讯作者: 杨迈之

Charge Transport Properties of TiO2 Nanocrystalline/Nanoporous Film

Hao Yan-Zhong, Yang Mai-Zhi, Yu Chi-Zhen, Cai Sheng-Min   

  1. College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1997-07-10 Revised:1997-10-15 Published:1998-04-15
  • Contact: Yang Mai-Zhi

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摘要：

用光电流作用谱、瞬态光电流、循环伏安及线性电位扫描法研究了TiO2纳米晶／纳米多孔膜电荷传输特性．结果表明TiO2纳米多孔膜的电荷传输与块体半导体不同．TiO2纳米晶电极的能带不弯曲，电子在导带中可向两个方向流动，电子既可以流向电极内部经由外电路输出．也可以流向电解质溶液被溶液中的受主捕获．在TiO2纳米多孔膜电极中，不仅在负电位区能带边随电位变化，而且在正电位区能带边随电位变化而移动，即带边不钉扎. 加入合适的施主可提高光电转换效率．加入受主则在电极溶液界面引起电子的严重损失，降低光电转换效率．

关键词: TiO2纳米晶/纳米多孔膜电极, 光电流作用谱, 电荷传输

Abstract:

Charge transport properties of TiO2 nanoporous film were investigated by electrochemical and photoelectrochemical methods. The results show that charge transports in nanoporous film are different from that in conventional bulk semiconductors. The electrons have free flows to both directions, thus the energy bands are unbent, the electron transports are controlled by concentration diffusion in conduction band of TiO2 nanoporous film. Adding acceptors will cause electron losses in the interface, band edges move with externally applied bias. adding appropriate donors will improve photon to current conversion efficiency.

Key words: TiO2 nanocrystalline/nanoporous film electrode, Photocurrent action spectra, Charge transport