Blue-light emission from GaN self-assembled quantum dots due to giant piezoelectric effect
Blue-light emission from GaN self-assembled quantum dots due to giant piezoelectric effect
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DOI：
10.1103/physrevb.58.r15989
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发表时间：
1998-12
影响因子：
3.7
通讯作者：
F. Widmann;J. Simon;B. Daudin;G. Feuillet;J. Rouviere;N. Pelekanos;G. Fishman
中科院分区：
文献类型：
--
作者：
F. Widmann;J. Simon;B. Daudin;G. Feuillet;J. Rouviere;N. Pelekanos;G. Fishman
研究表明，具有纤锌矿结构的GaN量子点的光学特性是约束效应和压电效应之间的平衡。在平均高度和直径分别为4.1和17 nm的“大”量子点中，光致发光峰集中在2.95 eV处，比GaN体带隙低近0.5 eV。我们将这种巨大的红移归因于存在于点中的5.5 MV/cm的巨大压电场，与理论计算一致。
It is shown that the optical properties of GaN quantum dots with the wurtzite structure result from a balance between confinement and piezoelectric effects. In ``large'' quantum dots with an average height and diameter of 4.1 and 17 nm, respectively, the photoluminescence peak is centered at 2.95 eV, nearly 0.5 eV below the bulk GaN band gap. We attribute this enormous redshift to a giant 5.5 MV/cm piezoelectric field present in the dots, in agreement with theoretical calculations.