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Chen, Jia-Shiang,

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Optical and Electronic Properties of Low-Dimensional Semiconductor Nanohybrids Based on Quantum Dots and 2D Materials /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optical and Electronic Properties of Low-Dimensional Semiconductor Nanohybrids Based on Quantum Dots and 2D Materials // Jia-Shiang Chen.
Author:	Chen, Jia-Shiang,
Description:	1 electronic resource (190 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 82-02, Section: B.
Contained By:	Dissertations Abstracts International82-02B.
Subject:	Materials science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27995593
ISBN:	9798664702934

Optical and Electronic Properties of Low-Dimensional Semiconductor Nanohybrids Based on Quantum Dots and 2D Materials /
Chen, Jia-Shiang,

Optical and Electronic Properties of Low-Dimensional Semiconductor Nanohybrids Based on Quantum Dots and 2D Materials /Jia-Shiang Chen. - 1 electronic resource (190 pages)

Source: Dissertations Abstracts International, Volume: 82-02, Section: B.

Low-dimensional nanomaterials, including colloidal quantum dots (QDs) and twodimensional (2D) materials, provide remarkable promise for energy harvesting and optoelectronic applications due to their high surface-to-volume ratio, easy processing, chemical stability, bandgap tunability, high in-plane conductivity, and polarizability. 2D materials, including graphene and transition metal dichalcogenides (TMDs), are stacked together by weak van der Waals forces, which can be mechanically exfoliated into atomic-scale thickness and leads to unique physical and optoelectronic properties. However, their atomically thin thickness results in weak photon absorption, limiting their optoelectronic performance. One way to improve the photon absorption and spectral selectivity is to combine 2D materials with zero-dimensional (0D) semiconducting QDs. Integrating the superior light-harvesting properties of QDs and other light harvesters with the high in-plane carrier mobility of atomically thin 2D materials can produce hybrids with improved photo-responsivity via efficient energy- or charge-transfer interactions. In order to understand and control the light-induced interfacial phenomena in these materials, my dissertation focuses on the charge transfer and energy transfer mechanisms between various kinds of nanohybrids from 0D, 1D to 2D materials by examining their optical and electronic properties.In particular, I combined near-infrared emitting PbS/CdS QDs with 2D-TMDs to demonstrate layer-dependent photoinduced electron transfer in the form of 0D-2D hybrid. The tunability of electron transfer rate can be achieved following bandgap engineering of (i) 2D-MoS2 flake thickness with varying number of layers from single to bulk, and (ii) PbS/CdS QDs via changing the size of QDs. My results pave the way for 2D materials as platforms for designing chargetransfer hybrid devices with low-dimensional nanomaterials. In order to distinguish the processes of charge and energy transfer, I investigated two types of 0D-2D hybrids (core-only and core/shell QDs combined with 2D-MoS2) and successfully differentiated their optoelectronic signatures by using scanning photocurrent microscopy (SPCM). I also studied biotic-abiotic nanosystems with directional stepwise energy transfer from QDs to allophycocyanin proteins and then to 2D-MoSe2, leading to significantly improved light harvesting. Single nanocrystals photoluminescence (PL) microscopy has been used for studying photoinduced charge transfer in novel 0D-2D and 1D-2D hybrids, combining perovskite nanomaterials and single-layer graphene, and PL blinking dynamics of isolated PbS/CdS QDs with internal charge-transfer process. The approach of combining poorly absorbing, highly conductive 2D materials by QDs provides a simple, yet efficient way for developing efficient lightharvesting and photonsensing devices in the field of next-generation optoelectronics.

English

ISBN: 9798664702934Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

2D materials

Optical and Electronic Properties of Low-Dimensional Semiconductor Nanohybrids Based on Quantum Dots and 2D Materials /
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520 $a Low-dimensional nanomaterials, including colloidal quantum dots (QDs) and twodimensional (2D) materials, provide remarkable promise for energy harvesting and optoelectronic applications due to their high surface-to-volume ratio, easy processing, chemical stability, bandgap tunability, high in-plane conductivity, and polarizability. 2D materials, including graphene and transition metal dichalcogenides (TMDs), are stacked together by weak van der Waals forces, which can be mechanically exfoliated into atomic-scale thickness and leads to unique physical and optoelectronic properties. However, their atomically thin thickness results in weak photon absorption, limiting their optoelectronic performance. One way to improve the photon absorption and spectral selectivity is to combine 2D materials with zero-dimensional (0D) semiconducting QDs. Integrating the superior light-harvesting properties of QDs and other light harvesters with the high in-plane carrier mobility of atomically thin 2D materials can produce hybrids with improved photo-responsivity via efficient energy- or charge-transfer interactions. In order to understand and control the light-induced interfacial phenomena in these materials, my dissertation focuses on the charge transfer and energy transfer mechanisms between various kinds of nanohybrids from 0D, 1D to 2D materials by examining their optical and electronic properties.In particular, I combined near-infrared emitting PbS/CdS QDs with 2D-TMDs to demonstrate layer-dependent photoinduced electron transfer in the form of 0D-2D hybrid. The tunability of electron transfer rate can be achieved following bandgap engineering of (i) 2D-MoS2 flake thickness with varying number of layers from single to bulk, and (ii) PbS/CdS QDs via changing the size of QDs. My results pave the way for 2D materials as platforms for designing chargetransfer hybrid devices with low-dimensional nanomaterials. In order to distinguish the processes of charge and energy transfer, I investigated two types of 0D-2D hybrids (core-only and core/shell QDs combined with 2D-MoS2) and successfully differentiated their optoelectronic signatures by using scanning photocurrent microscopy (SPCM). I also studied biotic-abiotic nanosystems with directional stepwise energy transfer from QDs to allophycocyanin proteins and then to 2D-MoSe2, leading to significantly improved light harvesting. Single nanocrystals photoluminescence (PL) microscopy has been used for studying photoinduced charge transfer in novel 0D-2D and 1D-2D hybrids, combining perovskite nanomaterials and single-layer graphene, and PL blinking dynamics of isolated PbS/CdS QDs with internal charge-transfer process. The approach of combining poorly absorbing, highly conductive 2D materials by QDs provides a simple, yet efficient way for developing efficient lightharvesting and photonsensing devices in the field of next-generation optoelectronics.
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