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Optical absorption band edge in single-crystal GeS

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
17
Issue
3
Identifiers
DOI: 10.1016/0038-1098(75)90311-7

Abstract

Abstract The absorption band edge of single-crystal orthorhombic GeS has been measured in all three polarizations at 4.2, 77 and 300°K. Strong excitonic absorption is observed for E ∥ a, and the transitions in this direction are identified as direct-allowed. Transitions in the E ∥ b and E ∥ c polarizations are tentatively identified as direct forbidden and direct allowed, respectively, with values for E g similar to those found for E ∥ a. Evidence for the partially two-dimenśional character of GeS is discussed.

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