An odmr investigation of the (Cu-li) and (cu-li)iiicomplex defects in gap

A. Kana-Ah, B. C. Cavenett, H. P. Gislason, B. Monemar, M. E. Pistol

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17 Citations (Scopus)


Co-doping of GaP with Cu and Li with a two-step diffusion procedure gives rise to several neutral associates involving both Cu and Li, as revealed by bound-exciton spectra in luminescence at low temperature. In this work, odmr studies of two such associates are reported, the (Cu-Li)Icentre with the lowest bound-exciton lines at 2.3062 eV (triplet) and 2.3072 eV (singlet), and the (Cu-Li)IIIcentre which has four electronic bound-exciton lines in luminescence, the lowest being a triplet at 2.2419 eV. In both cases the odmr spectra show clear triplet resonances associated with the respective lowest-energy bound-exciton states. For (Cu-Li)I an orthorhombic distortion of a basically trigonal axial centre is deduced from the angular dependence of odmr data, supporting an identification of the defect as Lij-CuGa- Li, where one Lijis bond-centred and the other is slightly distorted away from a tetrahedral interstitial site. For (Cu-Li)IIIthe symmetry of this defect is very close to trigonal, suggesting an identification as Lij-CuGa-Cu, where the Cu essentially remains in a tetrahedral interstitial position.

Original languageEnglish
Pages (from-to)1239-1250
Number of pages12
JournalJournal of Physics C: Solid State Physics
Issue number8
Publication statusPublished - 20 Mar 1986


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