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ocr_text: Design of the Heterostructure\n> Designing structures to preserve a compressive strain:\n1.Graded aluminum from AIN to GaN: with either a smooth grading or a step grading of different Al,Gaj,N layers in order to\ncontinually introduce compression into the layers.\n2.AIN interlayers: after growing GaN directly on the AIN nucleation layer, a new AIN layer is subsequently grown on this GaN layer.\nThe AIN quickly reaches its critical strain thickness and then relaxes. After this, a GaN layer can once again be grown in\ncompression on the AIN layer. 1 g=to00z)\n3.Thick superlattice structures: After the AIN nucleation layer, sul .GaN (or\nAlGaN) are grown, with the AIN relaxing sufficiently to put the GaN i 1 of the\ntension in the AIN and compression in the GaN gives a net addition d forsee\nnumber of these repeats can\nbe used to create thick structures, before the addition of a final GaN gi ielatetieSaERREaaaION .\n351 (2014)]\nPulse Summer School, Epitaxy Bases & Promises, Porquerolles, 2-8 July 2021 81
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