Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7118123 | Materials Science in Semiconductor Processing | 2018 | 5 Pages |
Abstract
The formation of crystalline structures and defects in GaN at three different cooling rates were investigated based on molecular dynamics simulations by using the Stillinger-Weber potential. The structural properties of GaN during the solidification processes were analyzed by several structural analysis methods. The system formed crystals at 200Â K when cooled at rates of 1011Â K/s and 1012Â K/s, whereas the amorphous state that formed at the cooling rate of 1013Â K/s included some crystal clusters. The ã4 0 0 0ã and ã2 3 0 0ã Voronoi polyhedrons were dominant in GaN during the rapid quenching processes. The ã4 0 0 0ã polyhedrons can aggregate to form cubic and hexagonal phases in GaN at lower temperatures. After solidification, cubic and hexagonal structures were coexistent in the system with a hybrid disordered region and crystal defects. When the temperature was decreased at a rate of 1011Â K/s, coherent twin boundaries, having excellent structural stability and configural continuity, were easily formed between the cubic and hexagonal crystal structures.
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Authors
Tinghong Gao, Kaiwen Li, Yidan Li, Xuechen Hu, Lei Ren, Xiangyang Luo, Quan Xie,