物理化学学报 >> 2003, Vol. 19 >> Issue (02): 158-162.doi: 10.3866/PKU.WHXB20030214

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掺杂纳米晶铁酸盐表面电子重组能与光伏特性的关系

李葵英;田秋雄;吴凤清;王德军   

  1. 燕山大学材料科学与工程学院,秦皇岛　066004;黑龙江省电力科学研究院,哈尔滨　150030;吉林大学 化学学院 物理化学研究所,长春　130023
  • 收稿日期:2002-04-17 修回日期:2002-07-08 发布日期:2003-02-15
  • 通讯作者: 李葵英 E-mail:likuiying@21cn.com

Relationship between Reorganization Energy of Surface Electrons and Photovoltaic Threshold of Nanocrystalline Ferrate

Li Kui-Ying;Tian Qiu-Xiong;Wu Feng-Qing;Wang De-Jun   

  1. Department of Materials Science and Engineering, Yanshan University, Qinhuangdao　066004;Heilongjiang Power Science Institute, Harbin　150030;Department of Chemistry, Jilin University, Changchun 130023
  • Received:2002-04-17 Revised:2002-07-08 Published:2003-02-15
  • Contact: Li Kui-Ying E-mail:likuiying@21cn.com

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摘要： 通过表面光伏（SPV）和电场诱导表面光伏(EFISPV)技术，以光量子激发空间电荷区内电荷的转移跃迁作为电子探针，测定纳米晶铁酸镧样品中掺杂锶前后表面光电阈值的变化.结果发现，在相同的敏感气体环境下，与纳米晶铁酸镧样品相比，掺杂的纳米晶铁酸锶镧的光电阈值显著降低，表现出更加明显的表面效应.提出利用掺杂前后样品阈值能量的改变，定量计算掺杂样品表面电子重组能的方法.分析并讨论产生上述表面电子重组能的主要原因.

关键词: 掺杂纳米晶, 表面电子重组, 光伏特性

Abstract: The threshold energies of photovoltaic response of both doped nano-La0.8Sr0.2FeO3 and undoped nano-LaFeO3 were probed by the vacuum adsorptive surface photovoltage technique. The results show that the threshold energy of nano-La0.8Sr0.2FeO3 is obviously smaller than that of nano-LaFeO3 under exposure to the sensor gas (ethanol vapor). And the difference between threshold energies of the two samples exposed to the sensor gas is increased, compared with that of them exposed to air. Moreover, by means of the difference of the threshold energies before and after doping Sr2＋ ion, the reorganization energy of surface electrons of doped sample can be quantitative calculated, i.e., Ers=b－a (where Ers is reorganization energy of surface electron of the sample, b and a is threshold energy before and after doping Sr2＋ ion respectively). The reason for producing reorganization energy of surface electrons is discussed.

Key words: Doped nanocrystal, Surface electronic reorganization, Photovoltage characters