Abstract
In order to detect some subtle differences concerning different atomic orderings presented in the CuInSe2 compound, low-temperature Raman scattering was carried out on CuInSe2 thin films. By considering the phonon dispersion curves and using the Ridley model, it shows that the chalcopyrite A1 mode decayed asymmetrically into phonons with frequencies of ∼123 and ∼50cm−1, which are attributed to a TO and a LA phonon along the Γ-X and Γ-N directions of the Brillouin zone. However, the A1 mode of the CuAu-ordered CuInSe2 showed almost no frequency change upon increasing the temperature up to 400K.
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