Optical Properties of $In_2S_3$ and $In_2S_3:Co^{2+}$ single crystal

$In_2S_3$ 및 $In_2S_3:Co^{2+}$ 단결정의 광학적 특성에 관한 연구

Single crystal of $In_2S_3$ and $In_2S_3:Co^{2+}$ were grown successfully with a good quality by the CTR(Chemical Transport Reaction)method. XRD analysis showed that the grown In2S3 and $In_2S_3:Co^{2+}$ single crystals were cubic structure. The optical absorption spectra of $In_2S_3:Co^{2+}$ single crystal showed impurity absorption peaks due to cobalt impurity. These impurity absorption pesks were assigned to the ligand transition between the split energy levels of $Co^{2+}$ ions with $T_d$ symmetry of these semiconductor host lattice.