High-quality AlN epitaxy on nano-patterned sapphire substrates prepared by nano-imprint lithography.
High-quality AlN epitaxy on nano-patterned sapphire substrates prepared by nano-imprint lithography.
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纳米压印光刻制备的纳米图案蓝宝石衬底上的高质量 AlN 外延
DOI:
10.1038/srep35934
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发表时间:
2016-11-04
影响因子:
4.6
通讯作者:
Shen B
中科院分区:
文献类型:
--
作者:
Zhang L;Xu F;Wang J;He C;Guo W;Wang M;Sheng B;Lu L;Qin Z;Wang X;Shen B
We report epitaxial growth of AlN films with atomically flat surface on nano-patterned sapphire substrates (NPSS) prepared by nano-imprint lithography. The crystalline quality can be greatly improved by using the optimized 1-μm-period NPSS. The X-ray diffraction ω-scan full width at half maximum values for (0002) and (102) reflections are 171 and 205 arcsec, respectively. The optimized NPSS contribute to eliminating almost entirely the threading dislocations (TDs) originating from the AlN/sapphire interface via bending the dislocations by image force from the void sidewalls before coalescence. In addition, reducing the misorientations of the adjacent regions during coalescence adopting the low lateral growth rate is also essential for decreasing TDs in the upper AlN epilayer.
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