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구 대칭형 양자점 코어/쉘에 대한 횡등방성체의 압전탄성 해
서소영(S. Y. Seo),유성식(S. S.Yoo),박승환(S. H. Park),박유근(Y. E. Pak) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Piezoelectric behavior of quantum dot core/shell structures in zinc-blende and wurtzite crystals are investigated in the framework of linear piezoelectricity. Since the core and the shell are often made from different materials with different lattice dimensions, the assembled QD core/shell structures can induce misfit strains. Thus, strains arising from lattice mismatch in the core/shell structure are modeled as eigenstrains resulting from size-mismatched inclusion embedded in a finite spherical piezoelectric medium. FEA for the case of rectilinear anisotropy was also performed since the obtained solution is spherical anisotropy which is tractable mathematically. The FEA showed considerable difference from the spherically anisotropic analytical solution. The obtained solutions, herein, can be used for any two-layer piezoelectric structures having spherical geometry subjected to various electromechanical loads.