High‐Performance and Stability of CsPbBr3/WSe2 Hybrid Photodetectors Functionalized Using Quaternary Ammonium Ligands

The 2D–0D hybrid photodetector, with its special structure, high sensitivity, and wavelength tunability, is reported as a promising candidate system for optoelectronic devices. As research on hybrid lead halide perovskite quantum dots (PQDs) has progressed, PQDs with high photoluminescence (PL) quan...

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Bibliographic Details
Published in:Advanced optical materials 2023-09, Vol.11 (17), p.n/a
Main Authors: Moon, Bowon, Ahn, Jae‐Hyeon, Jeong, Min‐Hye, Lee, Sang‐Hyeon, Lee, Jong‐Soo
Format: Article
Language:English
Subjects:
Carrier lifetime
detectivity
hybrid photodetectors
Lead compounds
Ligands
Materials science
Metal halides
Optics
Optoelectronic devices
perovskite quantum dots
Perovskites
Photoluminescence
Photometers
Quantum dots
surface ligand exchange
transition metal dichalcogenides
tunable bandgap
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Summary:The 2D–0D hybrid photodetector, with its special structure, high sensitivity, and wavelength tunability, is reported as a promising candidate system for optoelectronic devices. As research on hybrid lead halide perovskite quantum dots (PQDs) has progressed, PQDs with high photoluminescence (PL) quantum yield and excellent absorption properties are increasingly applied in optoelectronic devices; however, PQD stability remains one of the biggest limitations on device performance. Here, it is reported that the properties and stability of the hybrid photodetectors are improved by surface passivation using the quaternary ammonium ligand (didodecyldimethylammonium bromide, DDAB). The average carrier lifetime of DDAB treated CsPbBr3 PQDs (DDAB‐capped PQDs) is longer than that of pristine CsPbBr3 PQDs by 6.68–14.88 ns. It is confirmed that the durability against water is reduced by only 25.8% at PL intensity and is preserved for more than 16 h. A 2D–0D hybrid photodetector is then fabricated by deposition of DDAB‐capped PQDs on the WSe2 field‐effect transistor device for a high‐performance photodetector. The WSe2/DDAB‐capped PQD hybrid photodetector exhibits an enhanced responsivity of 1.4 × 103 A W−1 and an improved detectivity of 3.1 × 1013 Jones under 40.0 µW cm−2 of a 405 nm laser. High stability and optical properties of perovskite quantum dots (PQDs) with surface ligand exchange of oleylamine to didodecyldimethylammonium bromide (DDAB) are demonstrated. Not only is the photoluminescence quantum yield increased from 72% to 88% with narrow full width at half maximum after ligand exchange but the DDAB‐capped PQDs also maintain their luminescence against water conditions. The 2D–0D hybrid photodetector exhibits higher performance in detectivity and responsivity because of ligand passivation.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202300414