Positron Affinity, Deformation Potential and Diffusion Constant in AlxIn1-xSb Ternary Semiconductor Alloys

doi:10.1007/s40195-016-0433-y

Abstract

Abstract:

The present investigation deals with the positron behaviour in Al_xIn_1-_xSb ternary semiconductor alloys in the zinc-blende phase. The calculations are mainly based on a pseudopotential approach coupled with the independent particle model. Features such as elastic constants, electron and positron chemical potentials, positron deformation potential and positron diffusion constant are determined. Moreover, the positron affinity to InSb, AlSb and their related ternary alloys and heterostructures is calculated. The present results are compared to experiment and found to be in reasonably good agreement. The information gathered from the present study can help in understanding the positron trapping at interfaces and precipitates and might be useful in slow-positron-beam experiments.

Key words: Semiconductor alloys, Positrons, Diffusion, Surface and interface states, Heterostructures

Nour El-Houda Fares, Nadir Bouarissa. Positron Affinity, Deformation Potential and Diffusion Constant in Al_xIn_1-_xSb Ternary Semiconductor Alloys[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(7): 661-667.

Figures/Tables 12

References 35

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Compound	E_Г-Г (eV)	E_Г-X (eV)	E_Г-L (eV)
InSb	0.18^a	1.63^a	0.93^a
AlSb	2.30^b	1.615^b	2.211^b

Compound	E_Г-Г (eV)	E_Г-X (eV)	E_Г-L (eV)
InSb	0.18^a	1.63^a	0.93^a
AlSb	2.30^b	1.615^b	2.211^b

Material	Elastic constants (10¹¹ dyn/cm²)
Material	C₁₁	C₁₂	C₄₄	\( \langle C_{ii} \rangle \)
InSb	6.26^a 6.608^b	2.71^a 3.531^b	2.526^a 3.027^b	7.011^a
Al_0.5In_0.5Sb	8.073^a	3.471^a	3.267^a	9.039^a
AlSb	9.766^a 8.769^b	4.188^a 4.341^b	3.956^a 4.076^b	10.933^a

Material	Elastic constants (10¹¹ dyn/cm²)
Material	C₁₁	C₁₂	C₄₄	\( \langle C_{ii} \rangle \)
InSb	6.26^a 6.608^b	2.71^a 3.531^b	2.526^a 3.027^b	7.011^a
Al_0.5In_0.5Sb	8.073^a	3.471^a	3.267^a	9.039^a
AlSb	9.766^a 8.769^b	4.188^a 4.341^b	3.956^a 4.076^b	10.933^a

Material	µ_- (eV)	µ₊ (eV)	A⁺ (eV)
InSb	-0.09^a	-7.43^a	-7.52^a
Al_0.5In_0.5Sb	-0.57^a	-7.36^a	-7.92^a
AlSb	-0.81^a	-7.31^a	-8.12^a