Ultraviolet to Long-Wave Infrared Photodetectors Based on a Three-Dimensional Dirac Semimetal/Organic Thin Film Heterojunction

Ming Yang; Jun Wang; Yunkun Yang; Qi Zhang; Chunhui Ji; Guorong Wu; Yuanjie Su; Jun Gou; Zhiming Wu; Kaijun Yuan; Faxian Xiu; Yadong Jiang

doi:10.1021/acs.jpclett.9b01619

Ultraviolet to Long-Wave Infrared Photodetectors Based on a Three-Dimensional Dirac Semimetal/Organic Thin Film Heterojunction

J Phys Chem Lett. 2019 Jul 18;10(14):3914-3921. doi: 10.1021/acs.jpclett.9b01619. Epub 2019 Jul 1.

Authors

Ming Yang¹, Jun Wang^{1

2}, Yunkun Yang³, Qi Zhang⁴, Chunhui Ji¹, Guorong Wu⁴, Yuanjie Su¹, Jun Gou¹, Zhiming Wu^{1

2}, Kaijun Yuan⁴, Faxian Xiu^{3

5}, Yadong Jiang^{1

2}

Affiliations

¹ School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , P. R. China.
² State Key Laboratory of Electronic Thin Films and Integrated Devices , University of Electronic Science and Technology of China , Chengdu 610054 , P. R. China.
³ State Key Laboratory of Surface Physics and Department of Physics , Fudan University , Shanghai 200433 , P. R. China.
⁴ State Key Laboratory of Molecular Reaction Dynamics , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , P. R. China.
⁵ Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China.

PMID: 31248258
DOI: 10.1021/acs.jpclett.9b01619

Abstract

In this work, high-performance ultraviolet to long-wave infrared (UV-LIR) devices based on an N-type three-dimensional (3D) Dirac semimetal Cd₃As₂ and P-type organic (small molecules and polymers) heterojunction are prepared. Primarily, the photodetector shows a broadband photoresponse from 365 to 10600 nm. The optimized device responsivity is 729 mA/W, along with a fast response time of 282 μs and a high on-off ratio of 6268, which are 2 orders of magnitude higher than those previously reported for a 3D Dirac semimetal-based device. In the LIR region (10600 nm), the responsivity and on-off ratio can reach 81.3 mA/W and 100, respectively. In addition, the time-resolved femtosecond pump detection technology is used to reveal the relaxation time of Cd₃As₂/organic thin films (4.30 ps), indicating that Cd₃As₂/organic thin films have great potential for the manufacture of fast IR devices. These results demonstrate that the 3D Dirac semimetal/organic thin film heterojunction photodetectors will be a feasible solution for high-speed and broadband photodetectors in large-array imaging.