First-principles calculation of electroacoustic properties of wurtzite (Al,Sc)N
First-principles calculation of electroacoustic properties of wurtzite (Al,Sc)N
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纤锌矿(Al,Sc)N电声性能的第一性原理计算
DOI:
10.1103/physrevb.103.115204
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发表时间:
2020
影响因子:
3.7
通讯作者:
Ch. Elsässer
中科院分区:
文献类型:
--
作者:
D. F. Urban;O. Ambacher;Ch. Elsässer
We study the electroacoustic properties of aluminum scandium nitride crystalswith the metastable wurtzite structure by means of first-principles calculations based on density functional theory. We extract the material property data relevant for electroacoustic device design, namely, the full tensors of elastic and piezoelectric constants. Atomistic models were constructed and analyzed for a variety of Sc concentrations%. The functional dependence of the material properties on the scandium concentration was extracted by fitting the data obtained from an averaging procedure for different disordered atomic configurations. We give an explanation of the observed elastic softening and the extraordinary increase in piezoelectric response as a function of Sc content in terms of an element-specific analysis of bond lengths and bond angles.
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