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Physics

Direct Spatiotemporal Imaging of Charge Carrier Dynamics in Operative Semiconductor Devices

Adriano Cola, Antonio Valletta, Isabella Farella, Vaclav Dědič, Lorenzo Dominici

Featured July 26, 2026

Original Paper

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Simply

A new camera-like method uses light to see how tiny electric charges move inside working electronic devices, directly linking their hidden dance to the electricity we measure outside, like seeing inside a busy ant farm.

In depth
The paper introduces Carrier Dynamics by Pockels Imaging (CDPI), a novel method that directly visualizes photogenerated electron clouds and their associated currents within operative semiconductor devices. By leveraging the Pockels effect to non-invasively probe the local electric field, the technique establishes a unified picture of carrier transport, correlating internal dynamics with externally measurable currents, which was previously only inferred indirectly.

Key Takeaways

  • 1
    CDPI provides direct, non-invasive, and quantitative spatiotemporal imaging of internal charge carrier dynamics in operative semiconductor devices, overcoming limitations of indirect or perturbative methods.
  • 2
    The technique directly correlates the internal electric field evolution and carrier cloud morphology with externally measurable conduction and displacement currents, offering a unified view of charge transport.
  • 3
    CDPI enables detailed investigation of fundamental transport mechanisms like drift, diffusion, carrier-carrier interactions, and trapping/detrapping, revealing complex behaviors such as bi-Gaussian cloud shapes under high optical excitation.

Conceptual Flow

HIGH LEVEL
1
Methodology: Seeing Inside Devices with Light

The method shines a quick light pulse to create charges, then another light pulse measures how the electric field changes as those charges move, revealing their path.

Device with Electric Field
Pump Light Pulse
Probe Light Pulse
Measure Light Change
Internal Electric Field Map
Charge Movement Path
2
Results: Linking Internal Movement to External Power

By watching the charges move inside, the scientists can understand why the device's external electric current behaves the way it does, even seeing how charges get stuck or push each other.

Internal Charge Movement
Internal Electric Field
Calculate Device Current
External Current Signal
Charge Trapping Details