Figure 12.1540-MeV 209Bi ion irradiation 1.7 × 10 11 ions/cm 2 TEM images of AlGaN/GaN HEMT devices: (a) Gate region cross-section; (b) The orbital image of the heterojunction region shown in Figure (a); (c) The image shown in Figure (a) has a depth of approximately 500 nm; (d) Traces formed at the drain; (e) As shown in Figure (d), the trajectory appears at a depth of ap- proximately 500 nm [48] 图 12.1540-MeV 209Bi 离子辐照 1.7 × 10 11 ions/cm 2 的 AlGaN/GaN HEMT 器件的 TEM 图像: (a) 栅极区域截面; (b) 图 (a) 所示异质结区域轨道图 像; (c) 图 (a) 所示深度约 500 nm 图像; (d) 在漏极形成的痕迹; (e) 如图 (d) 所示,轨迹出现在深度约 500 nm 处 [48]