Abstract In recent years, the formate ion (HCO$_2 ^-)$ as a kind of hole-to-electron converter has attracted much attention of photographic researchers. The formate ions can trap photo-generated holes, eliminate or reduce the electron loss caused by electron--hole recombination in latent image formation process. Through the hole-to-electron conversion, it can also release an extra electron or electron carrier, improving photosensitivity. In this paper the microwave absorption and dielectric spectrum detection technique is used to detect the time evolution behaviour of free photoelectrons generated by 35ps laser pulses in cubic AgCl emulsions doped with formate ions. The influence of different doping conditions of formate ions on the photoelectron decay kinetics of AgCl is analysed. It is found that when the HCO$_2 ^-$ content is 10$^{ - 3}$mol/mol Ag and the doping position is 90% the electron decay time and lifetime reach their maxima due to the efficient trap of holes by formate ions.
Received: 16 May 2005
Revised: 29 December 2005
Accepted manuscript online:
PACS:
72.20.Jv
(Charge carriers: generation, recombination, lifetime, and trapping)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10354001, 60478033, and 10274017), the Natural Science Foundation of Hebei Province of China (Grant No 603138) and the Doctorate Foundation of Hebei Province of China (Grant No B2003119).
Cite this article:
Yang Shao-Peng (杨少鹏), Zhou Xian (周娴), Fu Guang-Sheng (傅广生), Li Xiao-Wei (李晓苇), Tian Xiao-Dong (田晓东), Han Li (韩理) Investigation of photoelectron action in cubic AgCl emulsion doped with formate ions 2005 Chinese Physics 14 2503
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