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Exciton electro‐reflectance of cuprous oxide crystals
Author(s) -
Shestatskii S. N.,
Sobolev V. V.,
Likhobabin N. P.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700420220
Subject(s) - exciton , reflectivity , materials science , electric field , spectral line , oxide , band bending , voltage , optics , condensed matter physics , optoelectronics , analytical chemistry (journal) , chemistry , physics , quantum mechanics , astronomy , metallurgy , chromatography
The electro‐reflectance spectrum of Cu 2 O single crystals was measured in the region of blue and violet exciton series (5000 to 4000 Å) at T = 77.3 °K. Both the modulating voltage U ac and the dc bias voltage U dc were varied. The electro‐reflectance structure obtained is due to the electric field effect on the n = 1 and n = 2 exciton lines of the blue and violet exciton series of cuprous oxide. The inversion of the electro‐reflectance structure occurs for some values of the ac voltage being different for various dc biases. This phenomenon is due to the presence of surface band bending of Cu 2 O samples investigated. Agreement was obtained with the basic conclusions of Aspnes and Frova's theory taking into account the influence of the surface field non‐uniformity on the line‐shapes of the electro‐reflectance spectra.