Insights into the Oxidation State of Cu Dopants in II–VI Semiconductor Nanocrystals

Mondal, Payel; Viswanatha, Ranjani

doi:10.1021/acs.jpclett.1c04076

Cited by 11 publications

(8 citation statements)

References 64 publications

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“…Previous reports established that Cu captures holes and that the electron remains free in the QD CB. 35 To further clarify the lifetime of photogenerated charge carriers, the PL decay spectra are performed in Figure 1e, and the fitting parameters are listed in Table S1. The PL lifetime for CdS QDs is about 48 ns, while a longer lifetime (355 ns) was observed for Cu:CdS QDs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In addition, the new emission center implies an introduction of a new sub-band gap state in CdS, which will offer a new charge transfer pathway in QDs. Previous reports established that Cu captures holes and that the electron remains free in the QD CB . To further clarify the lifetime of photogenerated charge carriers, the PL decay spectra are performed in Figure e, and the fitting parameters are listed in Table S1.…”

Section: Results and Discussionmentioning

confidence: 99%

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Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction

Zhang,

Liu,

Wang

et al. 2024

Inorg. Chem.

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Converting CO 2 into high-value-added chemicals has been recognized as a promising way to tackle the fossil fuel crisis. Quantum dots (QDs) have been extensively studied for photocatalytic CO 2 reduction due to their excellent optoelectronic properties. However, most of the photogenerated charge carriers recombine before they participate in the photocatalytic reaction. It is crucial to regulate the charge carriers to minimize undesired charge recombination, thus, promoting surface photocatalysis. Herein, we report a copperdoped CdS (Cu:CdS) QD photocatalyst for CO 2 reduction. Density functional theory simulations and experimental results demonstrate that Cu dopants create intermediate energy levels in CdS QDs that can extend the lifetime of exciton charge carriers. Furthermore, the long-lived charge carriers can be harnessed for the photocatalytic reaction on Cu:CdS QDs. The resultant Cu:CdS QDs exhibited a significantly enhanced photocatalytic activity toward CO 2 reduction compared to the pristine CdS QDs. This work highlights the importance of charge regulation in photocatalysts and opens new pathways for the exploration of efficient QD photocatalysts.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction

Zhang,

Liu,

Wang

et al. 2024

Inorg. Chem.

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“…These indicate that the emission of all the three samples is expected to originate from dopant related channels, similar to many Cu-doped nanocrystals. 41 In addition, the literature suggests that the formation of long-lived photogenerated states in copper-doped nanocrystals, lasting from tens to hundreds of microseconds, is presumably associated with carrier localization at deep localised traps. 35 Wherein, the shallow-delocalized traps of 1-CuInS and the deep-localized traps of 1-CuGaS and 2-CuGaS could also be reasonably explained.…”

Section: Resultsmentioning

confidence: 99%

Molecular insight into intrinsic-trap-mediated emission from atomically precise copper-based chalcogenide models

Xu,

Ding,

Zhang

et al. 2024

Inorg. Chem. Front.

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“…Because of the external energy provided by visible light, the carriers in the VB of CdSe QDs were excited and injected into the CB of CdSe QDs. In most semiconductors, the occupied VB and the vacant CB existed simultaneously [38]. Electrons were injected from the VB to the CB upon excitation by the external energy.…”

Section: Photovoltaic Working Mechanism Of the Devicementioning

confidence: 99%

CdSe-Co3O4@TiO2 nanoflower–based photoelectrochemical platform probing visible light–driven virus detection

et al. 2023

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The design and construction of a visible light-driven photoelectrochemical (PEC) device is described based on a CdSe-Co 3 O 4 @TiO 2 nanoflower (NF). Moreover, an application to the ultrasensitive detection of viruses, such as hepatitis E virus (HEV), HEV-like particles (HEV-LPs), and SARS-CoV-2 spike protein in complicated lysate solution, is demonstrated. The photocurrent response output of a PEC device based on CdSe-Co 3 O 4 @TiO 2 is enhanced compared with the individual components, TiO 2 and CdSe-Co 3 O 4 . This can be attributed to the CdSe quantum dot (QD) sensitization effect and strong visible light absorption to improve overall system stability. A robust oxygen-evolving catalyst (Co 3 O 4 ) coupled at the hole-trapping site (CdSe) extends the interfacial carrier lifetime, and the energy conversion efficiency was improved. The effective hybridization between the antibody and virus resulted in a linear relationship between the change in photocurrent density and the HEV-LP concentration ranging from 10 fg mL -1 to 10 ng mL -1 , with a detection limit of 3.5 fg mL -1 . This CdSe-Co 3 O 4 @TiO 2 -based PEC device achieved considerable sensitivity, good specificity, and acceptable stability and demonstrated a significant ability to develop an upgraded device with affordable and portable biosensing capabilities.

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Insights into the Oxidation State of Cu Dopants in II–VI Semiconductor Nanocrystals

Cited by 11 publications

References 64 publications

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction

Molecular insight into intrinsic-trap-mediated emission from atomically precise copper-based chalcogenide models

CdSe-Co3O4@TiO2 nanoflower–based photoelectrochemical platform probing visible light–driven virus detection

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Insights into the Oxidation State of Cu Dopants in II–VI Semiconductor Nanocrystals

Cited by 11 publications

References 64 publications

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO2 Reduction

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO2 Reduction

Molecular insight into intrinsic-trap-mediated emission from atomically precise copper-based chalcogenide models

CdSe-Co3O4@TiO2 nanoflower–based photoelectrochemical platform probing visible light–driven virus detection

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Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction

Generating Long-Lived Charge Carriers in CdS Quantum Dots by Cu-Doping for Photocatalytic CO₂ Reduction