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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Imaging Atomic Scale Dynamics on III-V Nanowire Surfaces During Electrical Operation.

J L Webb1, J Knutsson2, M Hjort2

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This study introduces a new platform for scanning tunneling microscopy (STM) to image atomic-scale surface changes in semiconductor devices during electrical operation. Unexpected surface smoothing and defect removal were observed on InAs nanowires under applied bias.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Semiconductor device functionality is increasingly limited by atomic-scale surface and interface properties.
  • These properties can dynamically change under applied voltages, impacting device performance and reliability.
  • Current methods lack the ability to observe these changes in situ at atomic resolution across the entire device.

Purpose of the Study:

  • To develop and demonstrate a novel device platform enabling simultaneous scanning tunneling microscopy (STM) imaging and full electrical operation.
  • To investigate the atomic-scale surface behavior of semiconductor nanowires under applied bias.
  • To explore the potential for new electronic functionalities arising from bias-induced surface restructuring.

Main Methods:

  • Development of a versatile device platform compatible with standard fabrication and scanning instrumentation.
  • Integration of STM imaging capabilities with full electrical operation across the device.
  • Proof-of-principle measurements on Indium Arsenide (InAs) and Gallium Arsenide (GaAs) nanowire devices with applied biases up to 4V.

Main Results:

  • Demonstration of STM imaging with atomic-scale resolution across the entire device during electrical operation.
  • Observation of unexpected atomic defect removal and surface smoothing on InAs nanowires under applied bias.
  • Contradiction of the anticipated increase in defects and electromigration-related failures.

Conclusions:

  • The developed platform enables in-situ atomic-scale investigation of device surfaces during operation.
  • Applied bias can induce beneficial surface restructuring, leading to defect removal and morphological smoothing.
  • This approach opens avenues for fundamental studies of device reliability and the discovery of novel electronic functionalities.