title: Ultrafast Broadband Photodetectors Based on Three-Dimensional Dirac Semimetal Cd3As2.
abstract: Photodetection with extreme performances in terms of ultrafast response time, broad detection wavelength range, and high sensitivity has a wide range of optoelectronic and photonic applications, such as optical communications, interconnects, imaging, and remote sensing. Graphene, a typical two-dimensional Dirac semimetal, has shown excellent potential toward a high-performance photodetector with high operation speed, broadband response, and efficient carrier multiplications benefiting from its linear dispersion band structure with a high carrier mobility and zero bandgap. As the three-dimensional analogues of graphene, Dirac semimetal Cd3As2processes all advantages of graphene as a photosensitive material but potentially has stronger interaction with light as a bulk material and thus enhanced responsivity. In this work, we report the realization of an ultrafast broadband photodetector based on Cd3As2. The prototype metal-Cd3As2-metal photodetector exhibits a responsivity of 5.9 mA/W with a response time of about 6.9 ps without any special device optimization. Broadband responses from 532 nm to 10.6 μm are achieved with a potential detection range extendable to far-infrared and terahertz. Systematical studies indicate that the photothermoelectric effect plays an important role in photocurrent generation. Our results suggest this emerging class of exotic quantum materials can be harnessed for photodetection with a high sensitivity and high speed (∼145 GHz) over a broad wavelength range.
authors.forename: Qinsheng
authors.initials: Q
authors.lastname: Wang
authors.forename: Cai-Zhen
authors.initials: CZ
authors.lastname: Li
authors.forename: Shaofeng
authors.initials: S
authors.lastname: Ge
authors.forename: Jin-Guang
authors.initials: JG
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.forename: Jiawei
authors.initials: J
authors.lastname: Lai
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Liu
authors.forename: Junchao
authors.initials: J
authors.lastname: Ma
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P. R. China.
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Yu
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P. R. China.
authors.forename: Zhi-Min
authors.identifier: 0000-0001-6361-9626
authors.initials: ZM
authors.lastname: Liao
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P. R. China.
authors.forename: Dong
authors.identifier: 0000-0002-0898-4548
authors.initials: D
authors.lastname: Sun
keywords: Dirac semimetal; photodetector; photothermoelectric effect; topological materials; ultrafast