Effects of acceptor doping and oxygen stoichiometry on the properties of sputter-deposited p-type rocksalt Ni Zn1O (0.3≤x≤1.0) alloys

Efficient Acceptor Doping of Sputter-Deposited p-Type NixGa1–xO Rocksalt Alloy with Li

“…The lowering of the ρ is even more dramatic as x increases, and for Ni-rich alloys with x ∼ 0.8, the ρ for the stoichiometric alloy is ∼270 Ω·cm, while that for the O-rich counterpart is ∼0.8 Ω·cm. These results are in good agreement with our previous works, showing that Li is a good acceptor in NiO-related alloys (NiO, Ni x Ga 1– x O, Ni x Zn 1– x O, and Ni x Cd 1– x O).…”

“…For the Ni x Ga 1– x O 1+δ :Li film with x ∼ 0.6, a low ρ ∼ 7 Ω·cm is measured. If we assumed a mobility of ∼0.5 cm 2 /V·s for this film, similar to our previous work on Li-doped Ni x Zn 1– x O 1+δ , a hole concentration of ∼2 × 10 18 cm –3 is obtained. We further note that since the VB dispersion of these NiO-related alloys is rather flat, which gives rise to a low hole mobility, the conduction type and hole concentration cannot be unambiguously determined by Hall measurements.…”

“…This is in agreement with doped and undoped O-rich NiO and NiO-related alloys. 51,52,54,55 The decrease of ρ with increasing temperature was attributed to an increase in the mobility due to a thermally activated hopping of the self-trapped carrier transport mechanism in these alloys. However, at a measurement temperature ≳150 °C (420 K), ρ of all films increases again.…”

Phase stability and thermal expansion of ZnO solid solutions with 3d transition metal oxides synthesized at high pressure

“…Hence, the properties of the solid solution can be tuned over a wide range of dopant concentrations while remaining within the field of its phase stability. Examples of materials interesting from the point of view of their semiconducting properties are ZnO solid solutions with magnesium oxide [2,3] and nickel oxide [4,5]. The research is developing in two directions: epitaxial stabilization of rs-ZnO in thin films on oriented substrates [2][3][4][5] and high-pressure phase transition of wurtzite ZnO into cubic one [6][7][8][9][10][11][12][13][14][15][16].…”

“…Crystallographic features of the structure [14][15][16][21][22][23][24], functional properties [4,5,8,15,22] and thermal expansion [21,25,26] of simple and complex metastable oxide systems remain a subject of particular attention due to future prospects for their practical application. At the same time, systematic studies of thermal stability of metastable solid solutions depending on the nature of the substituent cations have not been performed, and such data are absent in the literature.…”