- P-ISSN 1225-0163
- E-ISSN 2288-8985
Semiinsulating GaAs crystals employing LPLEC technique should be grown from the Ga-rich melt due to a very low incorporation of unintentional impurities such as carbon (<<TEX>$10^{15}cm^{-3}$</TEX>). High resisitivity of this material can be derived from the balanced compensation among not only EL2 deep donors and carbon acceptors but also H1 double charge native acceptors(Ev + 77meV, Ev + 200 meV) and H2 native acceptors(Ev + 68 meV). Considering of the complicated compensation mechanism using statistical calculation of the electron occupancy of each level, SI GaAs crystal with low impurity contents(<<TEX>$10^{15}cm^{-3}$</TEX>) can be successfully obtained by maintaining the melt composition around 0.45 As mole fraction.