研究生学术报告预告登记(开题、中期、答辩)

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报告人: 李佳奇
学号: 1017234042
学院: 电气与自动化工程学院
报告类型: 其他学术报告
日期: 15 October 2020
时间: 1:50 PM
地点: 中科院半导体研究所3号楼320
导师: 毛陆红
题目: Bipolar phototransistor in a vertical Au/graphene/MoS2 van der Waals heterojunction with photocurrent enhancement
内容提要:

Bipolar phototransistors have higher optical responsivity than photodiodes and play an important role in the field of photoelectric conversion. Two-dimensional materials offer a good optical response and has the potential advantage of heterogeneous integration, but mass-production is difficult. In this study, a bipolar phototransistor is presented based on a vertical Au/graphene/MoS2 Van der Waals heterojunction that can be mass-produced with silicon semiconductor process using a simple photolithography process. Au is used as the emitter, which is a functional material used not just for the electrodes, MoS2 is used for the collector and graphene in used for the base of the bipolar phototransistor. In the bipolar phototransistor, the electric field of the dipole formed by the Au and graphene contact is in the same direction as the external electric field, thus enhancing the photocurrent, and a maximum photocurrent gain of 18 is demonstrated. A mechanism for enhancing the photocurrent of the graphene/MoS2 photodiode by contacting Au with graphene is also described.

图片:
登记人: 李佳奇
登记时间: Tuesday, 29 September 2020, 9:19 AM