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Acta Physica Sinica (Overseas Edition), 1997, Vol. 6(6): 413-421    DOI: 10.1088/1004-423X/6/6/003
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THEORY OF PHOTOREFRACTIVE EFFECT FOR DOUBLE CARRIERS WITH TWO DEEP TRAPS AND A SHALLOW HOLE TRAP

LI YAN-QIU (李艳秋), LIU SHU-TIAN (刘树田), SUN WAN-JUN (孙万均), XU KE-BIN (许克彬), HONG JING (洪晶)
Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China
Abstract  We propose a new theoretical model of photorefractivity which consists of both electron and hole carriers with two deep traps and a shallow hole trap. The model predicts that,if the shallow trap accumulates a large density of charge carriers,the photoconductivity will be a sublinear (or superlinear) function of light intensity,and the space charge field will increase (or decrease) to a saturated value as the light intensity increases,depending on the sign of the dominant carrier. The comparison of this model with previous ones shows that it provides a more common description about the dependences of photoconductivi ty and space charge field on the light intensity.
Received:  24 June 1996      Revised:  06 January 1997      Accepted manuscript online: 
PACS:  42.65.Hw (Phase conjugation; photorefractive and Kerr effects)  
  42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials)  
  72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)  
  72.40.+w (Photoconduction and photovoltaic effects)  
Fund: Project supported by the National Natural Science Foundation of China and the Doctoral Foundation of the National Education Commission of China.

Cite this article: 

LI YAN-QIU (李艳秋), LIU SHU-TIAN (刘树田), SUN WAN-JUN (孙万均), XU KE-BIN (许克彬), HONG JING (洪晶) THEORY OF PHOTOREFRACTIVE EFFECT FOR DOUBLE CARRIERS WITH TWO DEEP TRAPS AND A SHALLOW HOLE TRAP 1997 Acta Physica Sinica (Overseas Edition) 6 413

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