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Atomic Force Microscopy01:08

Atomic Force Microscopy

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The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Mapping sensitivity of CVD diamond detector using synchrotron micro-beam.

Mohamed A E Abdel-Rahman1, Mohamed Y M Mohsen2, A Abdelghafar Galahom3

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Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|November 26, 2024
PubMed
Summary

Platinum (HPS-Pt) diamond is the best choice for synchrotron measurements. It shows a uniform response across sensitivity maps, improving with higher voltage, unlike other tested samples.

Keywords:
CVD diamondFocused x-ray beamMapping sensitivityRadiation detectorSynchrotron measurements

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Area of Science:

  • Materials Science
  • Synchrotron Radiation Physics
  • Semiconductor Device Characterization

Background:

  • Diamond's unique properties make it suitable for radiation detection.
  • Characterizing diamond sensitivity is crucial for optimizing synchrotron applications.
  • Micro-beam techniques offer high spatial resolution for material analysis.

Purpose of the Study:

  • To evaluate three distinct metal-contacted diamond samples for synchrotron measurements.
  • To identify the optimal diamond sample for high-resolution synchrotron radiation applications.
  • To understand the influence of bias polarity and nitrogen impurities on diamond sensitivity.

Main Methods:

  • Micro-beam sensitivity mapping at the Diamond Light Source (DLS) synchrotron.
  • Fabrication of Platinum (HPS-Pt), Aluminium/Platinum (HPS-Al/Pt), and Platinum (VS-Pt) contacted diamond samples.
  • High spatial resolution mapping with micro step displacement (up to 10 μm) on a lower purity sample.

Main Results:

  • The lower purity sample revealed detailed nitrogen lines, with bias polarity affecting photocurrent and stabilization times.
  • The HPS-Al/Pt sample showed no improvement in homogeneity or reliability, exhibiting high dark currents and unstable signals.
  • The HPS-Pt sample demonstrated a uniform response, significantly improving with increasing bias voltage up to 200V.

Conclusions:

  • The Platinum (HPS-Pt) sample is the most suitable candidate for synchrotron measurements due to its superior response homogeneity and stability.
  • Bias polarity and nitrogen content significantly impact diamond's photocurrent response characteristics.
  • Optimized diamond detector design is critical for reliable and sensitive synchrotron-based measurements.