Journal
NANOTECHNOLOGY
Volume 30, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab3b7a
Keywords
Tandem photodetector; solution-processed; colloidal quantum dots (CQDs); PbS0.4Se0.6:CsPbBr3 nanocomposite
Funding
- National Natural Science Foundation of China (NSFC) [81671787]
- Defense Industrial Technology Development Program [JCKY2016208B001]
Ask authors/readers for more resources
Recently, great attention has been paid to IV-VI colloidal quantum dots (CQDs) for their high photosensitivity, solution processability and low cost. Also, metal halide perovskites are very promising materials to realize the high-performance solution-processed visible-light photodetectors due to their cost-effective manufacturing, tunable absorption and photoluminescence in whole visible spectrum. In this paper, we present solution-processed CQDs-based tandem broadband photodetectors with low dark-current and high-sensitivity by inserting dielectric Polymethyl methacrylate (PMMA) interlayer between two sub-detectors. Our experimental data showed that the tandem broadband photodetector ITO/PEDOT:PSS/CsPbBr3:PbS0.4Se0.6/ZnO/PVK/CsPbBr3:PbS0.4Se0.6/Au showed a maximum specific detectivity of 6.8 x 10(13) Jones with a responsivity of 27 A W-1 under 57.8 mu W cm(-2) 980 nm illumination. The device performance can be further enhanced by inserting a 50 nm dielectric PMMA layer between the two sub-photodetectors. As the result, the tandem photodetector ITO/PEDOT:PSS/CsPbBr3:PbS0.4Se0.6/ZnO/PMMA(50 nm)/PVK/CsPbBr3:PbS0.4Se0.6/ZnO/Au exhibits a maximum specific detectivity of 1.32 x 10(14) Jones with a responsivity of 27.72 A W-1 under 57.8 mu W cm(-2) of 980 nm laser. Further, the physical mechanisms for the enhanced performance are discussed in detail.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available