Single-charge transport through hybrid core–shell Au-ZnS quantum dots: a comprehensive analysis from a modified energy structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Tuhin Shuvra Basu ◽  
Simon Diesch ◽  
Ryoma Hayakawa ◽  
Yutaka Wakayama ◽  
Elke Scheer
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Carrier Transport ◽  
Comprehensive Analysis ◽  
Energy Structure ◽  
Core Shell ◽  
Single Charge ◽  
Scanning Tunnelling Microscope ◽  
Single Carrier ◽  
Scanning Tunnelling

We examined the modified electronic structure and single-carrier transport of individual hybrid core–shell metal–semiconductor Au-ZnS quantum dots using a scanning tunnelling microscope.

Electronic Structure of CdSe/CdXZn1-XS Core/Shell Quantum Dots

2011 ◽  
Vol 284-286 ◽  
pp. 2037-2040
Author(s):  
Guo Zhi Jia ◽  
Yun Feng Wang ◽  
Jiang Hong Yao
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Kinetic Energy ◽  
Electronic Structures ◽  
Band Offset ◽  
Core Shell ◽  
Structure Parameters ◽  
Transition Energies ◽  
Mass Approximation ◽  
Energy Band Offset

The electronic structures of CdSe/CdxZn1-xS core/shell quantum dots are investigated systematically using the effective-mass approximation method. The calculated results have shown that both of the electron and hole are completely localized at the range of core, which can be ascribed to the large energy band offset in valence band and conduction band. The carriers appear in the region of core or shell, which mainly depend on the competition between the kinetic energy and the potential energy in the heterostrucuture QDs. The transition energies can be widely tuned by the changing the structure parameters.

scholarly journals Influence of sample momentum space features on scanning tunnelling microscope measurements

Nanoscale ◽  
2021 ◽  
Author(s):  
Maxwell T West ◽  
Muhammad Usman
Keyword(s):  
Electronic Structure ◽  
Momentum Space ◽  
Scanning Tunnelling Microscope ◽  
Theoretical Understanding ◽  
Scanning Tunnelling

Theoretical understanding of scanning tunnelling microscope (STM) measurements involve electronic structure details of the STM tip and the sample being measured. Conventionally, the focus has been on the accuracy of...

Electronic structure of ZnO/ZnS core/shell quantum dots

2013 ◽  
Vol 555 ◽  
pp. 191-195 ◽  
Author(s):  
Supriya Saha ◽  
Pranab Sarkar
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Core Shell

Interface control of electronic and optical properties in IV–VI and II–VI core/shell colloidal quantum dots: a review

2017 ◽  
Vol 53 (6) ◽  
pp. 1002-1024 ◽  
Author(s):  
Youngjin Jang ◽  
Arthur Shapiro ◽  
Maya Isarov ◽  
Anna Rubin-Brusilovski ◽  
Aron Safran ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electronic Structure ◽  
Chemical Stability ◽  
Interface Design ◽  
Colloidal Quantum Dots ◽  
Core Shell ◽  
Electronic And Optical Properties ◽  
Interface Control

Core/shell heterostructures provide controlled optical properties, tuneable electronic structure, and chemical stability due to an appropriate interface design.

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

1991 ◽  
Vol 49 ◽  
pp. 384-385
Author(s):  
W.K. Lo ◽  
J.C.H. Spence
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mechanical Stability ◽  
Scanning Tunnelling Microscope ◽  
Reflection Mode ◽  
Specimen Holder ◽  
Transmission Electron ◽  
Scanning Tunnelling ◽  
Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

On-Surface Radical Oligomerisation: A New Approach to STM Tip-Induced Reactions

2018 ◽  
Author(s):  
Gaolei Zhan ◽  
Younes Makoudi ◽  
Judicael Jeannoutot ◽  
Simon Lamare ◽  
Michel Féron ◽  
...  
Keyword(s):  
Sample Surface ◽  
Scanning Tunnelling Microscope ◽  
Transfer Event ◽  
New Approach ◽  
The Past ◽  
Organic Nanostructures ◽  
Scanning Tunnelling ◽  
New Strategy ◽  
Surface Fabrication ◽  
And Control

Over the past decade, on-surface fabrication of organic nanostructures has been widely investigated for the development of molecular electronic devices, nanomachines, and new materials. Here, we introduce a new strategy to obtain alkyl oligomers in a controlled manner using on-surface radical oligomerisations that are triggered by the electrons/holes between the sample surface and the tip of a scanning tunnelling microscope. The resulting radical-mediated mechanism is substantiated by a detailed theoretical study. This electron transfer event only occurs when <i>V</i><sub>s</sub> < -3 V or <i>V</i><sub>s</sub> > + 3 V and allows access to reactive radical species under exceptionally mild conditions. This transfer can effectively ‘switch on’ a sequence leading to formation of oligomers of defined size distribution due to the on-surface confinement of reactive species. Our approach enables new ways to initiate and control radical oligomerisations with tunnelling electrons, leading to molecularly precise nanofabrication.

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