Self-aligned-gate AlGaN/GaN heterostructure field-effect transistor with titanium nitride gate |
| |
| Affiliation: | 1.Institute of Technology and Science, Tokushima University, Tokushima, 770-8506, Japan;2.School of Electronic Science and Technology, Dalian University of Technology, Dalian 116024, China;3.School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, China |
| |
| Abstract: | Self-aligned-gate heterostructure field-effect transistor (HFET) is fabricated using a wet-etching method. Titanium nitride (TiN) is one kind of thermal stable material which can be used as the gate electrode. A Ti/Au cap layer is fixed on the gate and acts as an etching mask. Then the T-shaped gate is automatically formed through over-etching the TiN layer in 30% H2O2 solution at 95℃. After treating the ohmic region with an inductively coupled plasma (ICP) method, an Al layer is sputtered as an ohmic electrode. The ohmic contact resistance is approximately 0.3 Ω·mm after annealing at a low-temperature of 575℃ in N2 ambient for 1 min. The TiN gate leakage current is only 10-8 A after the low-temperature ohmic process. The access region length of the self-aligned-gate (SAG) HFET was reduced from 2 μm to 0.3 μm compared with that of the gate-first HFET. The output current density and transconductance of the device which has the same gate length and width are also increased. |
| |
| Keywords: | AlGaN/GaN HFETs wet etching self-aligned-gate |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|
