Abstract:
Three deep acceptor levels with activation energies of $\sim$0.7, $\sim$0.41, and $\sim$0.16 eV are found in GaAs structures, which have the hole type of conductivity and are grown by liquid-phase epitaxy, by the methods of capacitance spectroscopy (admittance spectroscopy and deep-level transient spectroscopy). The first two levels are known as HL2 and HL5 and are related to the features of GaAs-layer growth by liquid-phase epitaxy. They are effective recombination centers determining reverse currents in $p$–$i$–$n$ diodes, which is confirmed by studying the temperature dependences of reverse currents. The level with the energy $E_v$ + 0.16 eV can be related to the two-charge acceptor level of the inherent antisite defect in GaAs, which also determines the doping concentration of structures in the singly charged state.
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