Theoretical and Experimental Study on AlGaN/GaN Schottky Barrier Diode on Si Substrate with Double-Heterojunction

Theoretical and Experimental Study on AlGaN/GaN Schottky Barrier Diode on Si Substrate with Double-Heterojunction
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双异质结Si衬底AlGaN/GaN肖特基势垒二极管的理论与实验研究

DOI:
10.1186/s11671-020-03376-z
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发表时间:
2020-07
影响因子:
--
通讯作者:
Zhang Bo
Zhang Bo
中科院分区:
材料科学3区
文献类型:
--
作者:
Sun Tao;Luo Xiaorong;Wei Jie;Yang Chao;Zhang Bo

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在 GaN/AlGaN/GaN/Si-sub 上对具有双异质结的 AlGaN/GaN 肖特基势垒二极管 (SBD) 进行了理论和实验研究。二维空穴气(2DHG)和电子气(2DEG)分别形成在GaN顶部/AlGaN和AlGaN/GaN界面处。在关闭状态下,2DEH 和 2DHG 部分耗尽,然后完全消失。仍然存在固定的正、负极极化电荷,形成极化结。因此,在漂移区获得平坦的电场和高击穿电压(BV)。此外,阳极凹陷以降低开启电压(VON)。低损伤 ICP 蚀刻工艺可改善肖特基接触,并获得低漏电流和低 VON。所制造的 SBD 的 BV 为 1109V,阳极至阴极距离 (LAC) 为 11μm。所制造的 SBD 实现了 0.68 V 的低 VON 和良好的均匀性、室温下约 1010 的高开/关电流比、1.17 mΩ cm2 的低比导通电阻 (RON,SP) 以及 1051 MW/cm2 的高 Baliga 品质因数 (FOM)。
An AlGaN/GaN Schottky barrier diode (SBD) with double-heterojunction is theoretically and experimentally investigated on the GaN/AlGaN/GaN/Si-sub. The two-dimensional hole gas (2DHG) and electron gas (2DEG) are formed at the GaN-top/AlGaN and AlGaN/GaN interface, respectively. At the off-state, the 2DEH and 2DHG are partially depleted and then completely disappear. There remain the fixed positive and negative polarization charges, forming the polarization junction. Therefore, a flat electric field in the drift region and a high breakdown voltage (BV) are obtained. Moreover, the anode is recessed to reduce turn-on voltage (VON). The low-damage ICP etching process results in the improved Schottky contacts, and a low leakgae current and a lowVONis obtained. The fabricated SBD exhibits a BV of 1109 V with anode-to-cathode distance (LAC) of 11 μm. The fabricated SBDs achieve a lowVONof 0.68 V with good uniformity, a high on/off current ratio ∼ 1010at room temperature, a low specific on-resistance (RON,SP) of 1.17 mΩ cm2, and a high Baliga’s figure-of-merit (FOM) of 1051 MW/cm2.
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