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Related Concept Videos

Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...
Charging Conductors By Induction01:15

Charging Conductors By Induction

The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

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Related Experiment Video

Updated: May 22, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
11:30

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

Published on: March 6, 2017

Mapping Concurrent Charge Carrier Dynamics at Semiconductor Surfaces Using Frequency-Domain Surface Photovoltage

Chenwei Ni1,2, Jie Zhang1,3, Jian Zhu1

  • 1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.

ACS Nano
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

Frequency-domain inversion for surface photovoltage microscopy (FI-SPVM) reveals nanoscale charge carrier dynamics. This technique maps carrier lifetimes and polarities, advancing semiconductor research.

Keywords:
Charge carrier dynamicsFrequency-domain surface photovoltageKelvin probe force microscopyPhotoelectronic technologiesSemiconductor surfaces

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Concurrent Quantitative Conductivity and Mechanical Properties Measurements of Organic Photovoltaic Materials using AFM
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Last Updated: May 22, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Concurrent Quantitative Conductivity and Mechanical Properties Measurements of Organic Photovoltaic Materials using AFM
08:59

Concurrent Quantitative Conductivity and Mechanical Properties Measurements of Organic Photovoltaic Materials using AFM

Published on: January 23, 2013

Area of Science:

  • Surface science
  • Semiconductor physics
  • Spectroscopy

Background:

  • Understanding charge carrier dynamics at semiconductor surfaces is crucial for device performance.
  • Current methods lack the spatial and temporal resolution to fully characterize complex dynamics.

Purpose of the Study:

  • To introduce a novel technique, frequency-domain inversion for surface photovoltage microscopy (FI-SPVM), for quantitative analysis of surface charge carrier dynamics.
  • To achieve high spatial and temporal resolution for mapping concurrent carrier pathways.

Main Methods:

  • Combines Kelvin probe force microscopy with periodic illumination and lock-in detection.
  • Employs a linear time-invariant system model with convex inversion, sparsity, and total variation regularization.
  • Analyzes surface photovoltage spectra across a wide frequency range.

Main Results:

  • Resolves signed distributions of charge carrier relaxation times from nanoseconds to seconds.
  • Successfully disentangles overlapping carrier pathways and identifies their lifetimes and polarities.
  • Generates spatially resolved maps linking nanoscale structures to specific carrier dynamics.

Conclusions:

  • FI-SPVM provides a robust framework for mapping concurrent charge carrier dynamics with nanoscale resolution.
  • The technique is validated on synthetic and experimental data, demonstrating accuracy and practical applicability.
  • Offers broad potential for studying complex semiconductor systems like photocatalysts and perovskite photovoltaics.