›› 2014, Vol. 23 ›› Issue (9): 90702-090702.doi: 10.1088/1674-1056/23/9/090702
彭超a, 胡志远a, 宁冰旭a, 黄辉祥a, 樊双a, 张正选a, 毕大炜a, 恩云飞b
Peng Chao (彭超)a, Hu Zhi-Yuan (胡志远)a, Ning Bing-Xu (宁冰旭)a, Huang Hui-Xiang (黄辉祥)a, Fan Shuang (樊双)a, Zhang Zheng-Xuan (张正选)a, Bi Da-Wei (毕大炜)a, En Yun-Fei (恩云飞)b
摘要: We investigate the effects of 60Co γ-ray irradiation on the 130 nm partially-depleted silicon-on-isolator (PDSOI) input/output (I/O) n-MOSFETs. A shallow trench isolation (STI) parasitic transistor is responsible for the observed hump in the back-gate transfer characteristic curve. The STI parasitic transistor, in which the trench oxide acts as the gate oxide, is sensitive to the radiation, and it introduces a new way to characterize the total ionizing dose (TID) responses in the STI oxide. A radiation enhanced drain induced barrier lower (DIBL) effect is observed in the STI parasitic transistor. It is manifested as the drain bias dependence of the radiation-induced off-state leakage and the increase of the DIBL parameter in the STI parasitic transistor after irradiation. Increasing the doping concentration in the whole body region or just near the STI sidewall can increase the threshold voltage of the STI parasitic transistor, and further reduce the radiation-induced off-state leakage. Moreover, we find that the radiation-induced trapped charge in the buried oxide leads to an obvious front-gate threshold voltage shift through the coupling effect. The high doping concentration in the body can effectively suppress the radiation-induced coupling effect.
中图分类号: (Environmental effects on instruments (e.g., radiation and pollution effects))