Optical Absorption and Photoconductivity in Barium Oxide

W. W. Tyler; R. L. Sproull

doi:10.1103/PhysRev.83.548

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Optical Absorption and Photoconductivity in Barium Oxide

W. W. Tyler^* and R. L. Sproull

Cornell University, Ithaca, New York

^*Now at the Knolls Atomic Power Laboratory of the General Electric Company, Schenectady, New York.

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Phys. Rev. 83, 548 – Published 1 August, 1951

DOI: https://doi.org/10.1103/PhysRev.83.548

Abstract

Measurements of the optical absorption and photoconductivity in BaO single crystals are reported. The threshold photon energy for both processes is 3.8 ev, and the absorption constant at higher energies is at least $10^{5}$ ${cm}^{- 1}$ . A second increase in the absorption constant begins at about 4.8 ev and is not accompanied by photoconductivity. The observed dependence of photoconductivity on temperature and electric field strength indicates space charge effects in limiting current flow. The onset of absorption at 3.8 ev is thought to be due to the production of excitons, with the accompanying photoconductivity due to thermal dissociation of excitons or exciton ionization of impurity centers.

References (26)

J. P. Blewett, J. Appl. Phys. 10, 668, 831 (1939) ibid.17, 643 (1946) A. S. Eisenstein, Advances in Electronics (Academic Press, Inc., 1948), Vol. 1, pp. 1-64
N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Oxford University Press, 1940) F. Seitz, The Modern Theory of Solids (McGraw-Hill Book Company, Inc., New York, 1940)
Omitted endnote
Omitted endnote
Omitted endnote
R. T. Brice and J. Strong, Phys. Rev. 47, 255 (1935) J. Opt. Soc. Am. 25, 207 (1935)
J. P. Molnar and C. D. Hartman, Phys. Rev. 79, 1015 (1950)
W. W. Tyler, Phys. Rev. 76, 1887 (1949)
E. A. Taft and J. E. Dickey, Phys. Rev. 78, 625 (1950)
W. W. Tyler, Phys. Rev. 76, 179 (1949)
F. C. Nix, Revs. Modern Phys. 4, 723 (1932)
B. Gudden and R. W. Pohl, Z. Physik 17, 331 (1923)
B. Gudden and R. W. Pohl, Z. Physik 3, 123 (1920)
L. C. Roess, Rev. Sci. Instr. 16, 172 (1945)
Omitted endnote
G. B. Kistiakowsky, Rev. Sci. Instr. 2, 549 (1931)
Omitted endnote
Omitted endnote
H. Lenz, Ann. Physik 77, 449 (1925)
H. Lenz, Ann. Physik 83, 941 (1927)
Omitted endnote
N. F. Mott and R. W. Gurney, [2], pp. 76-78, 101
N. F. Mott and R. W. Gurney, [2], p. 104
N. F. Mott, Trans. Faraday Soc. 34, 500 (1938)
Mott Proc. Phys. Soc. (London) A167, 384 (1938) Ferguson (Phys. Rev. 66, 220 (1944)
L. Apker and E. Taft, Phys. Rev. 79, 964 (1950)

[c1] J. P. Blewett, J. Appl. Phys. 10, 668, 831 (1939) ibid.17, 643 (1946) A. S. Eisenstein, Advances in Electronics (Academic Press, Inc., 1948), Vol. 1, pp. 1-64

[c2] N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Oxford University Press, 1940) F. Seitz, The Modern Theory of Solids (McGraw-Hill Book Company, Inc., New York, 1940)

[c3] Omitted endnote

[c4] Omitted endnote

[c5] Omitted endnote

[c6] R. T. Brice and J. Strong, Phys. Rev. 47, 255 (1935) J. Opt. Soc. Am. 25, 207 (1935)

[c7] J. P. Molnar and C. D. Hartman, Phys. Rev. 79, 1015 (1950)

[c8] W. W. Tyler, Phys. Rev. 76, 1887 (1949)

[c9] E. A. Taft and J. E. Dickey, Phys. Rev. 78, 625 (1950)

[c10] W. W. Tyler, Phys. Rev. 76, 179 (1949)

[c11] F. C. Nix, Revs. Modern Phys. 4, 723 (1932)

[c12] B. Gudden and R. W. Pohl, Z. Physik 17, 331 (1923)

[c13] B. Gudden and R. W. Pohl, Z. Physik 3, 123 (1920)

[c14] L. C. Roess, Rev. Sci. Instr. 16, 172 (1945)

[c15] Omitted endnote

[c16] G. B. Kistiakowsky, Rev. Sci. Instr. 2, 549 (1931)

[c17] Omitted endnote

[c18] Omitted endnote

[c19] H. Lenz, Ann. Physik 77, 449 (1925)

[c20] H. Lenz, Ann. Physik 83, 941 (1927)

[c21] Omitted endnote

[c22] N. F. Mott and R. W. Gurney, [2], pp. 76-78, 101

[c23] N. F. Mott and R. W. Gurney, [2], p. 104

[c24] N. F. Mott, Trans. Faraday Soc. 34, 500 (1938)

[c25] Mott Proc. Phys. Soc. (London) A167, 384 (1938) Ferguson (Phys. Rev. 66, 220 (1944)

[c26] L. Apker and E. Taft, Phys. Rev. 79, 964 (1950)

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Optical Absorption and Photoconductivity in Barium Oxide

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References (26)

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