Ligand Exchange Functionalization of CIS Quantum Dots for CIS/ZnO Film Heterojunctions

Zheng, Yaxin; Sadeghimakki, Bahareh; Brunning, Jacob A.L.; Sivoththaman, Siva

doi:10.1109/tnano.2019.2927951

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…On the one hand, although there have been several reports on developing CuInS 2 QD-based PDs, these devices showed relatively low photoresponse abilities. , Also, pure CuInS 2 QDs suffer from poor stability: their optical properties are usually lost within a month . Alternatively, CuInS 2 QDs embedded within ZnS as a shell (CuInS 2 /ZnS) can significantly improve their stability and optical properties by surface passivation. , On the other hand, the reported PD devices with only one single QD thin film often have high dark leakage current and severe carrier recombination, which prohibits further enhancement of responsivity.…”

Section: Introductionmentioning

confidence: 99%

“…12 On the one hand, although there have been several reports on developing CuInS 2 QD-based PDs, these devices showed relatively low photoresponse abilities. 13,14 Also, pure CuInS 2 QDs suffer from poor stability: their optical properties are usually lost within a month. 15 Alternatively, CuInS 2 QDs embedded within ZnS as a shell (CuInS 2 /ZnS) can significantly improve their stability and optical properties by surface passivation.…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Liu

Zhao

et al. 2021

ACS Appl. Electron. Mater.

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QD-based high-performance photodetectors (PDs) typically contain hazardous elements such as lead-and cadmium-based materials, raising toxicity and safety concerns for optoelectronic devices. Here, we demonstrate solution-processed sandwich-structured PDs based on environmentally benign CuInS 2 /ZnS core−shell quantum dots (QDs) layer stacked with organic blend film of the hole transport material and electron transport material. Owing to an effective energy transfer from the photoexcited QDs to the adjacent organic blend films, charge separation and fast charge transport are significantly enhanced. Due to the unique heterojunction architecture, the dark current is substantially suppressed with the applied gate bias. The obtained PDs have a low dark current, a high detectivity of 3.8 × 10 11 Jones, and a fast response time (<5 ms). The detailed experimental investigation elucidates the critical aspects of the PDs. This work shows a feasible strategy to develop highly sensitive PDs from heavy-metal-free core−shell QDs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Liu

Zhao

et al. 2021

ACS Appl. Electron. Mater.

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“…Toward the goal of solution processed CISe PVs, a variety of different Se-precursors and ligand compositions have been investigated that yield different nascent PV efficiencies. ,,− The underlying photophysical processes that impact efficiency remain elusive, and while CISe NCs are generally believed to behave similarly to CIS, far less research is available for this composition. In this work, we examine CISe NCs passivated with three different ligands commonly used for synthesis of this material, namely, oleylamine (OLAm), diphenylphosphine (DPP), and tributylphosphine (TBP).…”

mentioning

confidence: 99%

Synthetic Ligand Selection Affects Stoichiometry, Carrier Dynamics, and Trapping in CuInSe₂ Nanocrystals

Harvey

Houck

et al. 2021

ACS Nano

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CuInSe2 nanocrystals exhibit tunable near-infrared bandgaps that bolster utility in photovoltaic applications as well as offer potential as substitutes for more toxic Cd- and Pb-based semiconductor compositions. However, they can present a variety of defect states and unusual photophysics. Here, we examine the effects of ligand composition (oleylamine, diphenylphosphine, and tributylphosphine) on carrier dynamics in these materials. Via spectroscopic measurements such as photoluminescence and transient absorption, we find that ligands present during the synthesis of CuInSe2 nanocrystals impart nonradiative electronic states which compete with radiative recombination and give rise to low photoluminescence quantum yields. We characterize the nature of these defect states (hole vs electron traps) and investigate whether they exist at the surface or interior of the nanocrystals. Carrier lifetimes are highly dependent on ligand identity where oleylamine-capped nanocrystals exhibit rapid trapping (<20 ps) followed by diphenylphosphine (<500 ps) and finally tributylphosphine (>2 ns). A majority of carrier population localizes at indium copper antisites (electrons), copper vacancies (holes), or surface traps (electrons and/or holes), all of which are nonemissive.

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Interfacial reactions and nucleation of WAl12 phase on electromigration in hydrogen exposed semiconductor interconnects

Kim

Choe

Ahn

et al. 2023

Applied Surface Science

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Ligand Exchange Functionalization of CIS Quantum Dots for CIS/ZnO Film Heterojunctions

Cited by 4 publications

References 41 publications

Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Synthetic Ligand Selection Affects Stoichiometry, Carrier Dynamics, and Trapping in CuInSe₂ Nanocrystals

Interfacial reactions and nucleation of WAl12 phase on electromigration in hydrogen exposed semiconductor interconnects

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Ligand Exchange Functionalization of CIS Quantum Dots for CIS/ZnO Film Heterojunctions

Cited by 4 publications

References 41 publications

Highly Sensitive CuInS2/ZnS Core–Shell Quantum Dot Photodetectors

Highly Sensitive CuInS2/ZnS Core–Shell Quantum Dot Photodetectors

Synthetic Ligand Selection Affects Stoichiometry, Carrier Dynamics, and Trapping in CuInSe2 Nanocrystals

Interfacial reactions and nucleation of WAl12 phase on electromigration in hydrogen exposed semiconductor interconnects

Contact Info

Product

Resources

About

Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Highly Sensitive CuInS₂/ZnS Core–Shell Quantum Dot Photodetectors

Synthetic Ligand Selection Affects Stoichiometry, Carrier Dynamics, and Trapping in CuInSe₂ Nanocrystals