Transient Photoconductivity in Silver Chloride at Low Temperatures

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Abstract
Primary photoconductivity has been investigated down to 6.5°K in single crystals of pure AgCl using low intensity, monochromatic light pulses and a sensitive electrometer. Results are presented which are in agreement with a theory of the transient response taking into account light absorption and electron trapping. The electron yield per absorbed photon (quantum efficiency) is found to be high, somewhat less than one, in the long-wavelength tail and through the first peak of optical absorption for all crystals and temperatures down to 6.5°K. These results agree with the proposed band scheme if one allows for direct and indirect transitions as discussed in Sec. V. Electron trappping properties are strongly dependent on sample preparation, but certain features are believed characteristic of the silver halides. Whereas the density of deep (0.5 ev) traps may be very low in well-annealed AgCl, a high density of very shallow (

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