Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10226618 | Optik - International Journal for Light and Electron Optics | 2019 | 8 Pages |
Abstract
We demonstrate a possibility to vary structural, morphological and optoelectronics parameters for kesterite Cu2ZnSnS4 nanocrystalline films using external laser beams at 1540ânm, and 770ânm or 1064ânm, and 532ânm. The illumination is performed both by single mode laser beams as well as by bicolor coherent treatment. The principal changes were observed for the density of electronic states in the valence band, third-order nonlinear optics, surface states. The energy density of the fundamental laser beams was continuously varied up to 250âJ/m2. The role of photo-thermal and phonon anharmonic contributions play here crucial role. The maximal changes of the electronic density of states and effective masses were achieved during simultaneous illumination by 1540ânm/770ânm Er: glass laser coherent bicolor laser beams. This result correlates well with the occurrence of the optical interference gratings, the formation of the nanocrystallites and surface morphology.
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Authors
A.M. El-Naggar, K. Ozga, A.A. Albassam, G. Lakshminarayana,