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Anisotropy of effective masses in CuInSe2

Yakushev, Michael V and Luckert, Franziska and Rodina, A.V. and Faugeras, C. and Karotki, A.V. and Mudryi, A.V. and Martin, Robert (2012) Anisotropy of effective masses in CuInSe2. Applied Physics Letters, 101. ISSN 0003-6951

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Anisotropy of the valence band is experimentally demonstrated in CuInSe2, a key component of the absorber layer in one of the leading thin-film solar cell technology. By changing the orientation of applied magnetic fields with respect to the crystal lattice, we measure considerable differences in the diamagnetic shifts and effective g-factors for the A and B free excitons. The resulting free exciton reduced masses are combined with a perturbation model for non-degenerate independent excitons and theoretical dielectric constants to provide the anisotropic effective hole masses, revealing anisotropies of 5.5 (4.2) for the A (B) valence bands.