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https://hdl.handle.net/2142/25843
Description
Title
Two quantum photoconductivity in potassium iodide
Author(s)
Bolte, Steven Bernard
Issue Date
1970
Doctoral Committee Chair(s)
Brown, Frederick C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
quantum photoconductivity
potassium iodide
Q-switched ruby laser
KDP harmonic generator
Language
en
Abstract
Photoconductivity associated with two quantum absorption processes
have been observed in uncolored crystals of KI. A Q-switched ruby laser
and a KDP harmonic generator were used to produce light pulses whose
quantum energy is more than half the band gap energy. The phbtbresponse
in KI depends upon the square of the incident light intensity. Since the
photo carriers are generated nearly uniformly throughout the crystal, the
technique is especially useful as an intrinsic generation mechanism for
transport experiments on crystals without F center or other donors.
The photoconductivity is observed to increase between one and two orders
of magnitude as the crystal is cooled from 77°K to 4°K reflecting the
increase in mobility as the longitudinal optical modes of lattice vibration
freeze out. The electric and magnetic field dependences indicate higher
mobilities than usually found in colored alkali halide crystals.
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