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Chin. Phys., 2003, Vol. 12(12): 1435-1439    DOI: 10.1088/1009-1963/12/12/017
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Investigation of the photoelectron decay of silver halide microcrystal

Yang Shao-Peng, Fu Guang-Sheng, Dong Guo-Yi, Li Xiao-Wei, Han Li
College of Physics Sciences & Technology, Hebei University, Baoding 071002, China
Abstract  The microwave absorption dielectric spectrum can be used to study the decay process of free photoelectrons and shallow-trapped electrons in semiconductor crystals. The decay curve of free photoelectrons and shallow-trapped electrons of silver halide grains is measured using this technique. The influence of iodide and K_4Fe(CN)_6 shallow electron trap dopants on the photoelectron lifetime of silver halide grains is studied. For the unsensitized cubic AgCl crystals, when the free photoelectron lifetime (FLT) reaches a maximum, the photographic efficiency is optimal. From our analysis, we conclude that FLT is the longest for the cubic AgCl crystals doped with 0.5% iodide at 80% doping position and 1×10^{-6} mol K_4Fe(CN)_6/molAg, whereas, for the highly photosensitized cubic AgBrCl crystals doped with K_4Fe(CN)_6, the photographic efficiency is optimal when the FLT reaches its minimum. The free photoelectron lifetime reaches minimum and the sensitivity of AgBrCl emulsion reaches maximum when the doping position is 30%Ag at K_4Fe(CN)_6 content of 10^{-6}mol/molAg.
Keywords:  microwave absorption dielectric spectrum      photoelectron lifetime      silver halide microcrystal     
Received:  23 January 2003      Published:  16 March 2005
PACS:  42.70.Gi (Light-sensitive materials)  
  07.68.+m (Photography, photographic instruments; xerography)  
Fund: Project Supported by the Key Science and Technology Research Program of Ministry of Education of China (Grant No 01011), Natural Science Foundation of Hebei Province, China (Grant No 603138), Natural Science Doctor Foundation of Hebei Province, China (Grant No B2003119), and Science and Technology Research Program of Education Bureau of Hebei Province, China (Grant No 2002153).

Cite this article: 

Yang Shao-Peng, Fu Guang-Sheng, Dong Guo-Yi, Li Xiao-Wei, Han Li Investigation of the photoelectron decay of silver halide microcrystal 2003 Chin. Phys. 12 1435

[1] Investigation of photoelectron temporal characteristics in silver halide microcrystals using the microwave absorption technique
Yang Shao-Peng, Fu Guang-Sheng, Dai Xiu-Hong, Dong Guo-Yi, Li Xiao-Wei, Han Li. Chin. Phys. B, 2004, 13(8): 1326-1329.
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