Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Effect of Melt Stoichiometry on the Native Defects of LEC GaAs

LEC GaAs의 점결함에 대한 Melt 조성의 영향

  • 고경현 (아주대학교 재료공학과) ;
  • 안재환 (아주대학교 재료공학과)
  • Published : 1991.02.01
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Abstract

The effects of the melt stoichiometry on the concentration of electron and hole traps formed by intrinsic defects of LEC GaAs were studied employing DLTS measurement technique. The concentration of EL2 were varied from $10^{16}cm^{-3}$ to $10^{11}cm^{-3}$ when the arsenic atomic fraction in the melt ([As]/{[As]+[Ga]} varied from 0.5 to 0.42. Specifically, when the fraction falls below 0.46, the 띠2 concentration start to decrease sharply. For 68meV and 77/200meV traps, their concentration increase inversely with the arsenic atomic fraction and have the values in the range of TEX>$10^{15}cm^{-3}$ and $10^{14}cm^{-3}$, respectively. It is, therefore, concluded that these hole traps originated from the intrinsic acceptor defects including $GS^{AS}$.

LEC법으로 성장된 GaAs의intrinsic defect에 의해서 형성된electron 및 hole trap의 농도와 성장시의 melt stoichiometry 와의 정량적 상관 관계를 DLTS법을 이용하여 분석하였다. EL2는 melt중 As의 분을 ([As]/{[As]+[Ga]})이 1.5에서 0.42까지 변하면 그 농도가 $10^{16}cm^{-3}$에서 $10^{11}cm^{-3}$정도로 감소되며, 이때 분율이 0.46 이하에서는 그 이상에서보다 As의 감소에 따라 급격히 감소하였다. 68meV 및 77/220meV의 경우는 As의 분율이 감소하면 증가하여 각각 $10^{15}cm^{-3}$ 및 $10^{14}cm^{-3}$ 정도의 농도를 가진다. 따라서 이 trap들은$GS^{AS}$와 관련된 defect들에 의해서 형성되었음을 알 수 있다.

Keywords

References

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