TY - JOUR
T1 - High-performance solution-processed colloidal quantum dots-based tandem broadband photodetectors with dielectric interlayer
AU - Sulaman, Muhammad
AU - Song, Yong
AU - Yang, Shengyi
AU - Hao, Qun
AU - Zhao, Yuejin
AU - Li, Maoyuan
AU - Saleem, Muhammad Imran
AU - Chandraseakar, Perumal Veeramalai
AU - Jiang, Yurong
AU - Tang, Yi
AU - Zou, Bingsuo
N1 - Publisher Copyright:
© 2019 IOP Publishing Ltd.
PY - 2019/9/2
Y1 - 2019/9/2
N2 - 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/ZnO/Au showed a maximum specific detectivity of 6.8 × 1013 Jones with a responsivity of 27 A W-1 under 57.8 μW 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 × 1014 Jones with a responsivity of 27.72 A W-1 under 57.8 μW cm-2 of 980 nm laser. Further, the physical mechanisms for the enhanced performance are discussed in detail.
AB - 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/ZnO/Au showed a maximum specific detectivity of 6.8 × 1013 Jones with a responsivity of 27 A W-1 under 57.8 μW 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 × 1014 Jones with a responsivity of 27.72 A W-1 under 57.8 μW cm-2 of 980 nm laser. Further, the physical mechanisms for the enhanced performance are discussed in detail.
KW - PbSSe:CsPbBr nanocomposite
KW - Tandem photodetector
KW - colloidal quantum dots (CQDs)
KW - solution-processed
UR - http://www.scopus.com/inward/record.url?scp=85071749819&partnerID=8YFLogxK
U2 - 10.1088/1361-6528/ab3b7a
DO - 10.1088/1361-6528/ab3b7a
M3 - Article
C2 - 31476138
AN - SCOPUS:85071749819
SN - 0957-4484
VL - 30
JO - Nanotechnology
JF - Nanotechnology
IS - 46
M1 - 465203
ER -