Photoinduced recharging process of Ni<sub>Ga</sub> in GaP and paramagnetic resonance of Ni<sub>Ga</sub><sup>2+</sup>
A Erramli; M S G Al-Ahmadi; W Ulrici; N Tebbal; J Kreissl; A -M Vasson; A Vasson; C A Bates; A Erramli; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; M S G Al-Ahmadi; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; W Ulrici; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; N Tebbal; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; J Kreissl; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; A -M Vasson; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; A Vasson; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France; C A Bates; Univ. Blaise Pascal-Clermont Ferrand II, Aubiere, France
Журнал:
Journal of Physics: Condensed Matter
Дата:
1991-08-19
Аннотация:
LEC-grown GaP:Ni in which the Fermi level is pinned by either the Ni<sup>2+</sup>/Ni<sup>3+</sup> or Ni<sup>+</sup>/Ni<sup>2+</sup> level has been investigated by optical absorption (OA), thermally detected (TD) optical absorption, electron paramagnetic resonance (EPR) and TD-EPR. The spectroscopic features, subsequently assigned to Ni<sub>Ga</sub><sup>+</sup>, Ni<sub>Ga</sub><sup>2+</sup> and Ni<sub>Ga</sub><sup>3+</sup>, were monitored under external illumination. The analysis of their spectral dependence together with the angular variation of a set of new TD-EPR peaks strongly suggests that the latter results are due to Ni<sub>Ga</sub><sup>2+</sup> ions. It also provides identification of the photoinduced recharging processes involving the three charge states of isolated Ni<sub>Ga</sub>. An orthorhombic Jahn-Teller model is presented to describe the Ni<sub>Ga</sub><sup>2+</sup> resonances in the TD-EPR experiments.
771.6Кб