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Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors
Abstract
Lead sulfide nanoparticles (PbS NPs) are used in the short-wavelength infrared photodetectors because of their excellent photosensitivity, band gap tunability, and solution processability. It has been a challenge to synthesize high-quality PbS NPs with an absorption peak beyond 2000 nm. In this work, using PbS seed crystals with an absorption peak at 1960 nm, we report a successful synthesis of very large monodispersed PbS NPs having a diameter up to 16 nm by multiple injections. The resulting NPs have an absorption peak over 2500 nm with a small full width at half-maximum of 24 meV. To demonstrate the applications of such large quantum dots (QDs), broadband heterojunction photodetectors are fabricated with the large PbS QDs of an absorption peak at 2100 nm. The resulting devices have an external quantum efficiency (EQE) of 25% (over 50% internal quantum efficiency) at 2100 nm corresponding to a responsivity of 0.385 A/W and an EQE of ∼60% in the visible range.
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“This relatively low EQE probably reflects the limited absorption of the vertically incident light in the thin layer of 2.1 μ mPbS QDs and the relatively low transmittance of ITO at 2.1 μ m. 36”
From A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µ m (2024) · cites this paper as [36]
In the citing paper
“Previous reports on QDPDs at 2.1 μ mhave demonstrated an impressively low dark current density of 10 -5 A/cm 2 and high responsivity. 36”
From A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µ m (2024) · cites this paper as [36]
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Metadata
- Authors
- Dong, C., Liu, S., Barange, N., Lee, J., Pardue, T., Yi, X., Yin, S., & So, F.
- Affiliations
- North Carolina State University (US)
- Corresponding author
- So, Franky
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-11-05
- Volume
- 11
- Issue
- 47
- Pages
- 44451-44457
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2985550280
- Cited by
- 116
- References
- 32
- Citations by year
- 2026: 30 · 2025: 16 · 2024: 26 · 2023: 18 · 2022: 9 · 2021: 12 · 2020: 5
- FWCI
- 2.35
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Semiconductor Detectors and Materials
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Keywords
- PbS quantum dots, PbS nanocrystals, short-wavelength infrared photodetectors, seed crystal growth, monodisperse nanoparticles, external quantum efficiency, visible light detection, band gap tuning
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