Free excitons in cubic CdS films

Kanemitsu, Yoshihiko; Nagai, Takehiko; Kushida, Takashi; Nakamura, Seiji; Yamada, Yoichi; Taguchi, Tsunemasa
January 2002
Applied Physics Letters;1/14/2002, Vol. 80 Issue 2, p267
Academic Journal
Cubic CdS layers have been epitaxially grown on (001) GaAs substrates by a low-pressure metalorganic chemical vapor deposition technique, and their free exciton states have been studied by means of modulated reflectance spectroscopy. Light-hole and heavy-hole excitons are split by biaxial compressive strains in the 2 μm CdS films. It has been found that a sharp photoluminescence (PL) appears at low temperatures and the PL energy coincides with the light-hole exciton energy. Two peaks in the PL excitation spectrum agree well with the light-hole and heavy-hole exciton energies. The free exciton energy has been determined for cubic CdS films on GaAs substrates. © 2002 American Institute of Physics.


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