Hole-dominated Fowler-Nordheim tunneling in 2D heterojunctions for infrared imaging

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 139-146
• 页数: 8页
• 语种: 英文

摘要

Heterostructures based on diverse two-dimensional(2D)materials are effective for tailoring and further promoting device performance and exhibit considerable potential in photodetection.However,the prob-lem of high-density thermionic carriers can be hardly overcome in most reported heterostructure devices based on type I and type II band alignment,which leads to an unacceptably small/photo/ldark and strong temperature dependence that limit the performance of photodetectors.Here,using the MoTe2/h-BN/MoTe2/h-BN heterostructure,we report the hole-dominated Fowler-Nordheim quantum tunneling trans-port in both on and off states.The state-of-the-art device operating at room temperature shows high detectivity of ＞108 Jones at a laser power density of ＜0.3 nW pm-2 from the visible to near infrared range.In addition,the fast on-off switching and highly sensitive photodetection properties promise superior imaging capabilities.The tunneling mechanism,in combination with other unique properties of 2D mate-rials,is significant for novel photodetection.