Polarization properties at rocksalt/wurtzite oxide interfaces

被引：6

作者：

Adamski, Nicholas L. ^{[1
]}

Dreyer, Cyrus E. ^{[2
,3
]}

Van de Walle, Chris G. ^{[4
]}

机构：

[1] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[3] Flatiron Inst, Ctr Computat Quantum Phys, 162 Fifth Ave, New York, NY 10010 USA

[4] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 20期

基金：

美国国家科学基金会;

关键词：

MACROSCOPIC POLARIZATION; BAND-GAPS; THERMOREFLECTANCE; ZNO;

D O I：

10.1103/PhysRevB.102.201301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The binary oxides MgO, CaO, ZnO, and CdO have a variety of band gaps which enables band-gap engineering over a wide range. ZnO takes the wurtzite structure, while MgO, CaO, and CdO take the rocksalt structure. We examine the formal polarization in these materials and in particular the formal polarization difference at the interface between ZnO and each of the rocksalt oxides. We find that any rocksalt oxide (including alloys) strained to ZnO will exhibit a very large polarization charge discontinuity of -0.907 Cm-2. Heterostructures between ZnO and the rocksalt oxides can therefore host a free-carrier gas with sheet densities up to 5.7 x10 14 cm(-2). Such large polarization fields and carrier densities may allow applications in tunnel junctions or as contact layers for UV devices.

引用

页数：5

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