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Second-harmonic generation from CuInSe2 thin films: influence of the substrate-epilayer lattice mismatch

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5 Author(s)
D. J. Bottomley ; Electrotech. Lab., Ibaraki, Japan ; A. Mito ; P. J. Fons ; S. Niki
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We investigate the second-order nonlinear optical (NLO) properties of tetragonal chalcopyrite-structure CuInSe2 thin films using optical second-harmonic generation at a fundamental wavelength of 790 nm. An approximate doubling of the second-order optical nonlinearity of the CuInSe2 thin films is achieved through changing the substrate from GaAs(001) to In0.29Ga0.71As(001), thereby reducing the lattice mismatch from 2.2% to 0.2%. This observation suggests that minimizing the lattice mismatch is a key requirement for the growth of high-quality NLO active chalcopyrite structure thin films and is in contrast to some other NLO active thin-film systems

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IEEE Journal of Quantum Electronics  (Volume:33 ,  Issue: 8 )