Cited by 118Quantum Dots Synthesis And PropertiesAdvanced Semiconductor Detectors and Materials2D Materials and Applications

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Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors

Dong, Chen, Liu, Shuyi, Barange, Nilesh, Lee, Jaewoong, Pardue, Tyler, Yi, Xueping, Yin, Shichen, So, Franky·2019·ACS Applied Materials & Interfaces

DOI 10.1021/acsami.9b16539

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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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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
ORCID: Dong, Chen
Lee, Jaewoong
Pardue, Tyler
Yin, Shichen
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
DOI: 10.1021/acsami.9b16539
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: doi.org/10.15223/policy-029 (stm-asf)
doi.org/10.15223/policy-037 (stm-asf)
doi.org/10.15223/policy-045 (stm-asf)
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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Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors

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