Study on $CuInTe_2$ Single Crystals Growth and Characteristics (II)

$CuInTe_2$ 단결정 성장과 특성연구(II)

  • You S.H. (Department of Physics, Chosun University) ;
  • Hong K.J. (Department of Physics, Chosun University) ;
  • Lee S.Y. (Department of Physics, Chosun University) ;
  • Shin Y.J. (Department of Physics, Chosun University) ;
  • Lee K.K. (Department of Physics, Chosun University) ;
  • Suh S.S. (Department of Physics, Chosun University) ;
  • Kim S.U. (Department of Physics, Chosun University) ;
  • Jeong J.W. (Department of Physics, Chosun University) ;
  • Shin Y.J. (Department of Physics, Jeonbuk National University) ;
  • Jeong T.S. (Department of Physics, Jeonbuk National University) ;
  • Shin B.K. (Department of Physics, Jeonbuk National University) ;
  • Kim T.S. (Department of Physics, Jeonbuk National University) ;
  • Moon J.D. (Department of Physics, Dongshin University)
  • Published : 1997.06.01

Abstract

[ $CuInTe_2$ ] synthesised in a horizontal electric furnace was found to be polycrystalline. Single crystals of $CuInTe_2$ were grown with the vertical Bridgman technique. The photoconductivity and photoluminescence of the crystals were measured in the temperature range 20 to 293 K. From the photocurrent peaks measured for the samples both perpendicular and parallel to c-axis, the energy band gaps of the samples were found to be 0.948 eV and 0.952 eV at room temperature respectively. The energy difference of the photocurrent and photoluminescence peaks of the samples both perpendicular and parallel to the c-axis measured at room temperature was a phonon energy, and its values were 22.12 meV and 21.4 meV respectively. The splitting of the valence band due to spin-orbit and crystal field interaction was calculated from the photocurrent spectra of the samples, The ${\Delta}cr\;and\;{\Delta}so$ are 0.046,0.014 eV respectively.

[ $CuInTe_2$ ] 다결정은 수평전기로에서 합성하고, $CuInTe_2$ 단결정은 수직 Bridgman 방법으로 성장시켰다. $CuInTe_2$ 단결정의 c축에 수직 및 평행한 시료의 광전도도와 광발광특성을 293K에서 20 K의 온도영역에서 측정하였다. 측정된 광전류 봉우리로부터 구한 c축에 수직 및 평행한 시료의 에너지 띠 간격은 상온에서 각각 0.948 eV와 0.952 eV였다. 광전류 봉우리와 광발광 봉우리의 에너지차는 포논에너지이며 상온에서 c축에 수직 및 평행한 시료의 에너지차는 각각 22.12 meV와 21.4 meV였다. 또한 광전류 스펙트럼으로부터 시료의 spin-orbit 상호작용과 결정장 상호작용에 의한 가전자대의 갈라짐 ${\Delta}cr$${\Delta}so$는 각각 0.046, 0.014 eV였다.

Keywords