Related Experiment Video
Updated: Jan 10, 2026
07:12
A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
10.3K
Edge and defect effects on charge distribution in collapsed MoS2 nanotubes
Matjaž Malok1,2, Janez Jelenc1, Anja Pogačnik Krajnc1,2
1Solid State Physics Department, Jozef Stefan Institute Ljubljana Slovenia matjaz.malok@ijs.si.
Nanoscale Advances
|November 24, 2025
Summary
Structural defects in molybdenum disulfide (MoS2) nanotubes act as charge traps, hindering device performance. Understanding these imperfections is key for developing robust next-generation electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Molybdenum disulfide (MoS2) nanotubes (NTs) are promising for advanced electronics.
- Defects and surface damage degrade MoS2 device performance and introduce hysteresis.
- Curved MoS2 NTs present unique charge-trapping mechanisms compared to planar structures.
Purpose of the Study:
- To investigate the impact of structural irregularities on charge transport in collapsed MoS2 NTs.
- To understand how defects influence electrical characteristics at the nanoscale.
- To identify defect-related charge-trapping and scattering mechanisms.
Main Methods:
- Utilized scanning tunnelling microscopy (STM) for atomic-level imaging.
- Employed Kelvin probe force microscopy (KPFM) for surface potential mapping.
- Applied conductive atomic force microscopy (c-AFM) to probe local conductivity.
Main Results:
- Structural defects act as charge traps, scattering centers, and transport barriers.
- Observed reduced carrier mobility and localized charge accumulation due to defects.
- Found spatially inhomogeneous charge distribution influenced by structural irregularities.
Conclusions:
- Structural defects significantly impact charge injection, redistribution, and electrical properties in MoS2 NTs.
- Nanoscale characterization is crucial for designing high-performance, defect-tolerant transition metal dichalcogenide (TMD) devices.
- Addressing structural imperfections is vital for improving the stability and lifetime of MoS2-based electronics.
More Related Videos
08:12Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
12.7K
11:14Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
Published on: May 28, 2016
14.3K
Related Concept Videos
01:20MOSFET: Depletion Mode
797
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
797
01:22MOSFET: Enhancement Mode
757
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
757
01:17Characteristics of MOSFET
892
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
892
01:25MOS Capacitor
1.4K
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
1.4K
01:27Biasing of Metal-Semiconductor Junctions
528
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
528
01:24Metal-Semiconductor Junctions
880
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
880