期刊
ADVANCED FUNCTIONAL MATERIALS
卷 24, 期 19, 页码 2875-2882出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201303204
关键词
-
类别
资金
- SunShot Initiative - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Office of Solar Energy Technology [DE-AC36-08GO28308]
The increase of the band gap in Zn1-xMgxO alloys with added Mg facilitates tunable control of the conduction band alignment and the Fermi-level position in oxide-heterostructures. However, the maximal conductivity achievable by doping decreases considerably at higher Mg compositions, which limits practical application as a wide-gap transparent conductive oxide. In this work, first-principles calculations and material synthesis and characterization are combined to show that the leading cause of the conductivity decrease is the increased formation of acceptor-like compensating intrinsic defects, such as zinc vacancies (V-Zn), which reduce the free electron concentration and decrease the mobility through ionized impurity scattering. Following the expectation that non-equilibrium deposition techniques should create a more random distribution of oppositely charged dopants and defects compared to the thermodynamic limit, the paring between dopant Ga-Zn and intrinsic defects V-Zn is studied as a means to reduce the ionized impurity scattering. Indeed, the post-deposition annealing of Ga-doped Zn0.7Mg0.3O films grown by pulsed laser deposition increases the mobility by 50% resulting in a conductivity as high as sigma = 475 S cm(-1)
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据