Related Experiment Video
Updated: Feb 6, 2026
10:28
Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
Published on: July 5, 2016
10.7K
Development of in situ optical-electrical MEMS platform for semiconductor characterization
Songhua Cai1, Chenyi Gu1, Yifan Wei1
1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Ultramicroscopy
|August 10, 2018
Summary
Researchers developed a new system for in situ transmission electron microscopy (TEM) to study optoelectronic semiconductor materials. This allows simultaneous optical and electrical measurements for better understanding of material properties.
Area of Science:
- Materials Science
- Nanoscience
- Condensed Matter Physics
Background:
- In situ transmission electron microscopy (TEM) is rapidly advancing, enabling dynamic material analysis under stimuli.
- Optoelectronic semiconductors are vital for clean energy, communications, and pollution control.
- Understanding dynamic behavior under working conditions is key to improving optoelectronic material performance.
Purpose of the Study:
- To develop an advanced in situ TEM system for characterizing optoelectronic semiconductor materials.
- To enable simultaneous optical and electrical measurements during TEM analysis.
- To facilitate a deeper understanding of optoelectronic semiconductor working mechanisms.
Main Methods:
- Designed a microelectromechanical-system-chip-based system for sample illumination within a TEM.
- Integrated simultaneous in situ optical and electrical measurement capabilities.
- Utilized advanced TEM technologies for dynamic material observation.
Main Results:
- Successfully developed a novel system for in situ TEM analysis of optoelectronic materials.
- Enabled concurrent optical and electrical characterization within the microscope.
- Provided a platform for observing dynamic material responses under combined stimuli.
Conclusions:
- The developed system significantly enhances the study of optoelectronic semiconductors.
- Simultaneous in situ optical and electrical measurements are crucial for accurate characterization.
- This advancement paves the way for improved design and application of optoelectronic devices.
Related Concept Videos
01:22Semiconductors
1.6K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.6K
01:20Types of Semiconductors
1.5K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.5K
01:24Metal-Semiconductor Junctions
1.1K
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...
1.1K
01:27Biasing of Metal-Semiconductor Junctions
616
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...
616
01:13Finding Electric Potential From Electric Field
5.6K
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
5.6K
01:12Determining Electric Field From Electric Potential
5.0K
The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
5.0K