Mh. Rakowsky et al., ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF A NATIVE ACCEPTOR IN AS-GROWN ZNGEP2, Applied physics letters, 64(13), 1994, pp. 1615-1617
Electron paramagnetic resonance (EPR) has been used to investigate an
acceptor in as-grown single crystals of ZnGeP2. The spectra are charac
terized by equally spaced triplets with 1:2:1 intensity ratios represe
nting hyperfine interactions (varying from 35 to 55 G in magnitude) wi
th two equivalent phosphorous nuclei. Their angular dependence shows t
hat there are four crystallographically equivalent orientations of the
defect. The principal values of the g matrix are 2.002, 2.021, and 2.
074 and the corresponding principal axes, at one of the four sites, ar
e the [011], [100], and [01 1] directions, respectively. Two possible
models are suggested for this acceptor: Either a zinc vacancy (V(Zn))
or a zinc ion on a germanium site (Zn(Ge)). It also is suggested that
the acceptor responsible for the EPR signal is the same acceptor, name
ly AL1, that gives rise to a dominant near-infrared absorption band.