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Apr 29, 2020

ACS Spring 2020 National Meeting & Expo

Layer-dependent photoinduced electron transfer in 0D−2D PbS/CdS−layered MoS2 hybrids

2D materials

quantum dots

SPCM

charge transfer

Abstract

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Abstract

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Keywords

2D materials

quantum dots

SPCM

charge transfer

Abstract

Hybrid nanostructures constructed from semiconductor quantum dots (QDs, or 0D nanomaterials) and layered transition metal dichalcogenides (TMDs, or 2D materials) have risen as superior hybrid nanostructures when utilized in optoelectronic applications due to their mixed functionality, enhanced sensitivity, and band-gap tunability. Here, we have demonstrated interfacial electron transfer in core/shell PbS/CdS QDs and layered 2D-MoS2 hybrids by laser-induced time-resolved photoluminescence (PL) and photocurrent imaging measurements. The tunability of electron transfer rate can be achieved following band-gap engineering of (i) MoS2 flake thickness throughout a series of hybrids with varying number of layers from monolayer to bulk, and (ii) by band-gap engineering of PbS/CdS QDs via changing QDs core size. We provide the mechanistic picture of electron transfer between a point donor (QD) and a surface acceptor (2D-MoS2), derived from Marcus’s theory for nonadiabatic electron transfer in weakly coupled systems and we show that this model fits rather well our experimental data of layer-dependent electron transfer. Our results provide a guideline for designing QD−TMD charge-transfer hybrid devices and indicate that a well-performing hybrid in terms of electron transfer will have a core-only donor PbS QD of smallest possible size achievable through colloidal synthesis and a few layers MoS2 absorption counterpart.

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© Copyright 2019 Morressier GmbH.
All rights reserved.