Mixed phases in p-type CuInSe2 thin films detected by using micro-Raman scattering spectroscopy

In order to detect some subtle differences concerning different atomic orderings presented in the CuInSe(2) compound, low-temperature Raman scattering was carried out on CuInSe(2) thin films. By considering the phonon dispersion curves and using the Ridley model, it shows that the chalcopyrite A(1) mode decayed asymmetrically into phonons with frequencies of similar to 123 and similar to 50 cm(-1), which are attributed to a TO and a LA phonon along the Gamma-X and Gamma-N directions of the Brillouin zone. However, the A(1) mode of the CuAu-ordered CuInSe(2) showed almost no frequency change upon increasing the temperature up to 400 K. (C) 2008 American Institute of Physics.