Chapter

Physical Properties of Silver Halides

Tadaaki Tani

in Photographic Science

Published in print August 2011 | ISBN: 9780199572953
Published online January 2012 | e-ISBN: 9780191731266 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199572953.003.0003
Physical Properties of Silver Halides

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The light absorption in relation to band structure, dark conductivity with ionic carriers, and photoconductivity with electronic carriers of AgX are described, being focused on the differences between its single crystals and small grains available for photographic materials. The absorption and emission of AgX in the visible region are weak due to their indirect transitions, and enhanced by quantum-size effect. The charge carriers of the dark conductivity of AgX grains are interstitial silver ions, which are transferred from surface kink sites, and are more abundant by several orders of magnitude than that in the single large crystal of the corresponding AgX. The mobility of electrons in AgX grains (~1 cm2/Vs) is much smaller than that in a single crystal of the corresponding AgX (~50 cm2/Vs), having many shallow traps in the latter available for photographic process.

Keywords: indirect transition; ionic conductivity; interstitial silver ion; space charge layer; microwave photoconductivity method; photoelectrons

Chapter.  17076 words.  Illustrated.

Subjects: Atomic, Molecular, and Optical Physics

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