Open AccessHigh performance mid-wave infrared photodetector based on graphene/black phosphorus heterojunction
Author(s) -
Xuemin Zhang,
Chenggang Yan,
Xin Hu,
Qingsong Dong,
Zhiyi Liu,
Weiming Lv,
Zeng Chen,
Rongtao Su,
Yudong Wang,
Tianyu Sun,
Zeyu Xing,
Chao Pang,
Baoshun Zhang,
Wei Shi,
Minsheng Long
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abed14
Subject(s) - photodetector , optoelectronics , responsivity , materials science , heterojunction , infrared , graphene , visible spectrum , schottky barrier , black phosphorus , optics , nanotechnology , physics , diode
Black phosphorus (BP) as a promising candidate for mid-wave infrared (MWIR) detection has attracted much attention. However, the high-speed photoresponse at the MWIR is yet to be a challenge. In this paper, we report a BP-graphene heterostructure photodetector with fast photoresponse at MWIR range using molybdenum electrode as a contact to realizing a low Schottky barrier. The device exhibits a fast photoresponse in a broad-spectrum range from visible to MWIR (0.67–4.2 μ m). A high photovoltaic responsivity up to 183 mA W −1 and EQE up to 35.6% were realized at the visible range of 0.637 μ m light and respectively 7.9 mA W −1 and 0.31% at MWIR 3098 nm. The specific detectivity D * = 6.69 × 10 8 Jones is obtained at 1 mV bias under the illumination of the MWIR 4.25 μ m in the ambient condition. Our work may open a new way to realizing fast MWIR photoresponse at the low light level.