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김남오,김형곤,김덕태,송호준,Kim, Nam-Oh,Kim, Hyung-Gon,Kim, Duck-Tea,Sung, Heo-Jun 대한전기학회 2003 전기학회논문지 P Vol.52 No.2
$Zn_4SnSe_6$ and $Zn_4SnSe_6:Co^{2+}$ single crystals were grown by the chemical transport reaction(CTR) method. They were crystallized in the monoclinic structure. These temperature dependence of the optical energy gap were closely investigated over the temperature range 10[K]~300[K]. The direct energy gaps of $Zn_4SnSe_6$ and $Zn_4SnSe_6$:$Co^{2+}$ single crystals were given by 2.146[eV] and 2.042[eV] at 300[K]. The temperature dependence of the optical energy gap is well presented by the Varshni equation.