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ocr_text: Effect of the Barrier Material\n» Designing structures to improve the HEMT characteristics: .\n1.The AlGaN/AIN/GaN double heterojunction with the insertion fred\nof a thin AIN layer of the order of 1nm between the AlGaN barrier and E\nthe GaN channel. The AIN “spacer” layer GaN cap 5mm =\nallows more e- to accumulate in the GaN channel Eo 3\ncombined with better confinement due to the |\nThis gives lower sheet resistance: R, = 1 [butferlayer HENS barrier thickness (A)\n2. Design of the AlGaN capping with largeit/Al 2 on\ncontent or lattice-matched AlInN to reach larger AN 2500m _ 16\n5\nNs values. GaN 250nm £12\n3 \ £ Sheet carrier density > 1x1013 cm2 :\ni 8 @ 300K Schematic of a typical 04 |\n3s) - peck | [Y. Cordier et al., AlGaN/GaN HEMT structure 0\nH rT) their Modern Devices, 2013)] Univ. Nice (2009)] Univ. Nice (2013)] Er Ld Fie)
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