TY - JOUR
T1 - Interlayer of PMMA Doped with Au Nanoparticles for High-Performance Tandem Photodetectors
T2 - A Solution to Suppress Dark Current and Maintain High Photocurrent
AU - Sulaman, Muhammad
AU - Sulaman, Muhammad
AU - Song, Yong
AU - Yang, Shengyi
AU - Yang, Shengyi
AU - Saleem, Muhammad Imran
AU - Li, Maoyuan
AU - Perumal Veeramalai, Chandrasekar
AU - Zhi, Ruonan
AU - Jiang, Yurong
AU - Cui, Yanyan
AU - Hao, Qun
AU - Zou, Bingsuo
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/6/10
Y1 - 2020/6/10
N2 - Currently, colloidal quantum dots (CQDs)-based photodetectors are widely investigated due to their low cost and easy integration with optoelectronic devices. The requirements for a high-performance photodetector are a low dark current and a high photocurrent. Normally, photodetectors with a low dark current also possess a low photocurrent, or photodetectors with reduced dark current possess a reduced photocurrent, resulting in low detectivity. In this paper, a solution to suppress dark current and maintain a high photocurrent, i.e., use of poly(methyl methacrylate) doped with Au nanoparticles (NPs) (i.e., PMMA:Au) as an interlayer for enhanced-performance tandem photodetectors, is presented. Our experimental data showed that the dark current through the tandem photodetector ITO/PEDOT:PSS/PbS:CsSnBr3/ZnO/PMMA:Au/CuSeN/PbS:CsSnBr3/ZnO/Ag is suppressed significantly; meanwhile, a high photocurrent is maintained after a PMMA:Au interlayer has been inserted between two subdetectors. The inserted PMMA:Au interlayer acts as storage nodes for electrons, reducing the dark current through the device; meanwhile, the photocurrent can be enhanced under illumination. As a result, the specific detectivity of the tandem photodetector with 35 nm PMMA:Au interlayer was enhanced significantly from 5.01 × 1012 to 2.7 × 1015 Jones under 300 μW/cm2 532 nm illumination at a low voltage of -1 V as compared to the device without a PMMA:Au interlayer. Further, the physical mechanism of enhanced performance is discussed in detail.
AB - Currently, colloidal quantum dots (CQDs)-based photodetectors are widely investigated due to their low cost and easy integration with optoelectronic devices. The requirements for a high-performance photodetector are a low dark current and a high photocurrent. Normally, photodetectors with a low dark current also possess a low photocurrent, or photodetectors with reduced dark current possess a reduced photocurrent, resulting in low detectivity. In this paper, a solution to suppress dark current and maintain a high photocurrent, i.e., use of poly(methyl methacrylate) doped with Au nanoparticles (NPs) (i.e., PMMA:Au) as an interlayer for enhanced-performance tandem photodetectors, is presented. Our experimental data showed that the dark current through the tandem photodetector ITO/PEDOT:PSS/PbS:CsSnBr3/ZnO/PMMA:Au/CuSeN/PbS:CsSnBr3/ZnO/Ag is suppressed significantly; meanwhile, a high photocurrent is maintained after a PMMA:Au interlayer has been inserted between two subdetectors. The inserted PMMA:Au interlayer acts as storage nodes for electrons, reducing the dark current through the device; meanwhile, the photocurrent can be enhanced under illumination. As a result, the specific detectivity of the tandem photodetector with 35 nm PMMA:Au interlayer was enhanced significantly from 5.01 × 1012 to 2.7 × 1015 Jones under 300 μW/cm2 532 nm illumination at a low voltage of -1 V as compared to the device without a PMMA:Au interlayer. Further, the physical mechanism of enhanced performance is discussed in detail.
KW - CsSnBrperovskites
KW - PbS colloidal quantum dots (CQDs)
KW - interlayer
KW - low dark current
KW - solution-processed
KW - tandem photodetectors
UR - http://www.scopus.com/inward/record.url?scp=85086346903&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c04093
DO - 10.1021/acsami.0c04093
M3 - Article
C2 - 32419464
AN - SCOPUS:85086346903
SN - 1944-8244
VL - 12
SP - 26153
EP - 26160
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 23
ER -