Photoconductivity parameters in lithium niobate
作者:
Robert Gerson,
J. F. Kirchhoff,
L. E. Halliburton,
D. A. Bryan,
期刊:
Journal of Applied Physics
(AIP Available online 1986)
卷期:
Volume 60,
issue 10
页码: 3553-3557
ISSN:0021-8979
年代: 1986
DOI:10.1063/1.337611
出版商: AIP
数据来源: AIP
摘要:
Measurements on a variety of doped (magnesium and/or iron) and undoped lithium niobate crystals in the oxidized state demonstrate an Arrhenius dependence of dark conductivity on reciprocal temperature between 460 and 590 K. All of the crystals had roughly the same conductivity and activation energy (1.21 eV) over the temperature range, implying that all have about the same free‐carrier concentration and mobility. The enhanced photoconductivity of magnesium‐doped lithium niobate is attributed to a greatly reduced trapping cross section of Fe3+for electrons, the smaller cross section being due to a changed substitutional site for Fe3+. The Fe3+trapping cross section is calculated from photoconductivity data to be of order 10−18m2in undoped lithium niobate. This implies a photoelectron lifetime of order 6×10−11s in a relatively pure (2‐ppm Fe) oxidized crystal.
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