J. Mater. Sci. Technol. ›› 2021, Vol. 68: 216-226.DOI: 10.1016/j.jmst.2020.06.047

• Research Article • Previous Articles     Next Articles

Solution-processed, flexible and broadband photodetector based on CsPbBr3/PbSe quantum dot heterostructures

Jinming Hua,b, Shengyi Yanga,b,c,*(), Zhenheng Zhanga,b, Hailong Lia,b, Chandrasekar Perumal Veeramalaia,b, Muhammad Sulamana,b,d, Muhammad Imran Saleema,b, Yi Tangd, Yurong Jiangd, Libin Tangc, Bingsuo Zoue,**()   

  1. a Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
    b Key Laboratory of Advanced Optoelectronic Quantum Design and Measurement, Ministry of Education, Beijing Institute of Technology, Beijing, 100081, China
    c Kunming Institute of Physics, Kunming, 650223, China
    d Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
    e MOE Key Lab of New Processing Technology for Nonferrous Metals and Materials and Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China
  • Received:2020-04-26 Revised:2020-05-30 Accepted:2020-06-22 Published:2021-03-30 Online:2021-05-01
  • Contact: Shengyi Yang,Bingsuo Zou
  • About author:*Beijing Key Laboratory of Nanophotonics and UltrafineOptoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing,100081, China. E-mail addresses: syyang@bit.edu.cn (S. Yang),

Abstract:

Due to their promising applications in foldable displays, optical communication equipment and environmental monitoring systems, flexible and broadband optoelectronic devices have gained extensive attention in recent years. Here, a flexible and broadband photodetector based on CsPbBr3/PbSe quantum dot (QD) heterostructures is firstly presented. The integrated QD heterostructures possess consecutive detection range from ultraviolet (UV) to long-wavelength infrared (LW-IR) regions with efficient light absorption and chemical stability, in comparison with the pristine PbSe QDs. Systematic material characterizations reveal the improved exciton dissociation, carrier transport and carrier lifetime of the QD heterostructures. Flexible photodetector Ag/CsPbBr3/PbSe/Ag demonstrate a high responsivity of 7.17 A/W with a specific detectivity of 8.97 × 1012 Jones under 25 μW/cm2 365 nm illumination at 5 V. Furthermore, it could maintain 91.2 % (or 94.9 %) of its initial performance even after bending for thousands of times (or exposing in ambient air for 4 weeks). More importantly, its response time is shortened more than three orders of magnitude as that of pristine PbSe QDs-based photodetectors. Therefore, it provides a feasible and promising method for the next-generation high-performance broadband photodetectors via constructing heterostructures of various QDs.

Key words: Quantum dots, Broadband detection, Flexible photodetectors, Fast photoresponse speed, Heterostructures