Multilayer Black Phosphorus Near-Infrared Photodetectors

Sensors

Yang Wang¹  Chaojian Hou¹  Lijun Yang¹  Qihan Zhang²  Lixin Dong²  Bo Li²  Qiuyang Yue²  Yuefeng Li³  Zhan Yang⁴ 

[1] A Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA;Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA;School of Mechatronics Engineering, Soochow University, Soochow 215000, China;

关键词: black phosphorus;    larger layer thickness;    near-infrared photodetection;    optoelectronic device;   

DOI  :  10.3390/s18061668

来源: DOAJ

【 摘 要 】

Black phosphorus (BP), owing to its distinguished properties, has become one of the most competitive candidates for photodetectors. However, there has been little attention paid on photo-response performance of multilayer BP nanoflakes with large layer thickness. In fact, multilayer BP nanoflakes with large layer thickness have greater potential from the fabrication viewpoint as well as due to the physical properties than single or few layer ones. In this report, the thickness-dependence of the intrinsic property of BP photodetectors in the dark was initially investigated. Then the photo-response performance (including responsivity, photo-gain, photo-switching time, noise equivalent power, and specific detectivity) of BP photodetectors with relative thicker thickness was explored under a near-infrared laser beam (λIR = 830 nm). Our experimental results reveal the impact of BP’s thickness on the current intensity of the channel and show degenerated p-type BP is beneficial for larger current intensity. More importantly, the photo-response of our thicker BP photodetectors exhibited a larger responsivity up to 2.42 A/W than the few-layer ones and a fast response photo-switching speed (response time is ~2.5 ms) comparable to thinner BP nanoflakes was obtained, indicating BP nanoflakes with larger layer thickness are also promising for application for ultra-fast and ultra-high near-infrared photodetectors.

【 授权许可】

Unknown