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Chinese Physics, 2005, Vol. 14(12): 2595-2597    DOI: 10.1088/1009-1963/14/12/035
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Origin of ultraviolet photovoltaic effect in Fe3O4 thin films

Zhao Kun (赵昆)ac, Feng Jia-Feng (丰家峰)b, Huang Yan-Hong (黄延红)a, Zhao Jian-Gao (赵见高)b, Lü Hui-Bin (吕惠宾)a, Han Xiu-Feng (韩秀峰)b, Zhan Wen-Shan (詹文山)b
a Key Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b State Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; c International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
Abstract  We have investigated the transport and ultraviolet photovoltaic properties of Fe$_{3}$O$_{4}$ thin films grown on glass substrates by facing-target sputtering technique. The nonlinear dependence of current-density on voltage suggests that the transport process is most likely the tunnelling process and grain boundaries act as barriers. Furthermore, nonequilibrium electron-hole pairs are excited in the grains and grain boundary regions for Fe$_{3}$O$_{4}$ film under ultraviolet laser, since the energy gap of Fe$_{3}$O$_{4}$ is smaller than the ultraviolet photon energy. And then the built-in electric field near the grain boundaries will separate carriers, leading to the appearance of an instant photovoltage.
Keywords:  photovoltaic effect      magnetite      thin film  
Received:  31 May 2005      Revised:  19 September 2005      Accepted manuscript online: 
PACS:  73.50.Pz (Photoconduction and photovoltaic effects)  
  75.70.Ak (Magnetic properties of monolayers and thin films)  
  75.47.Pq (Other materials)  
  68.37.Ps (Atomic force microscopy (AFM))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10334070 and 50371102) and China Postdoctoral Science Foundation.

Cite this article: 

Zhao Kun (赵昆), Feng Jia-Feng (丰家峰), Huang Yan-Hong (黄延红), Zhao Jian-Gao (赵见高), Lü Hui-Bin (吕惠宾), Han Xiu-Feng (韩秀峰), Zhan Wen-Shan (詹文山) Origin of ultraviolet photovoltaic effect in Fe3O4 thin films 2005 Chinese Physics 14 2595

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