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8614423 
Journal Article 
Highly sensitive infrared detector based on a two-dimensional heterojunction 
Zhang, JY; Lyu, JP; Ni, ZH 
2021 
14 
1 
87-99 
Chinese 
To achieve weak signal detection, high sensitivity is required. Because of their strengths in optical and electrical properties such as wide spectral absorption, adjustable bandgap, and high carrier mobility, graphene, Transition Metal dichalcogenides (TMDs), Black Phosphorus (BP) and other two-dimensional (2D) materials have been used to fabricate infrared detectors. However, those 2D materials have disadvantages of weak light absorption, low carrier mobility and air instability, that restrict their applications in high-sensitivity infrared detection. Compared with single two-dimensional material, heterostructures consisting of two or more single 2D materials adopt the characteristics of each single material as well as some novel physical properties from heterojunctions/interfaces. In recent years, the heterostructure of 2D materials has been studied extensively in the field of high-sensitivity infrared detection. To gain a deep understanding of the factors affecting sensitivity, we provide a comprehensive review of the strategies that improve the sensitivity of infrared detectors and the development of high-sensitivity infrared detectors based on 2D heterojunctions in recent years. We summarize the figures of merit of these infrared detectors and identify the existing challenges impeding further improvements in sensitivity. Finally, by summarizing the challenges of future improving the sensitivity of infrared detection prospects for strategies to obtain high-sensitivity infrared detectors with good comprehensive performance and commercial applicability are presented with considerations for balancing the detector's responsivity and response speed, large area two-dimensional heterojunction preparation, heterojunction interface optimization, and so forth. Copyright ©2021 Chinese Optics. All rights reserved. 
2D materials; Heterojunction; High sensitivity; Infrared detection