Diamond-based alpha particle detectors with coplanar geometry

S. G. Wang*, Qing Zhang, Q. Wang, S. F. Yoon, J. Ahn, Q. Zhou, D. J. Yang, J. Q. Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In this paper, we report the results concerning significant improvement of charge collection efficiency for chemical vapor deposition (CVD) diamond-based alpha particle detectors with coplanar geometry by reducing the inter-electrode spacing from 100 to 25 μm. CVD diamond films used were prepared employing hot-filament CVD technique. Electrical contacts of the detectors were only patterned on the growth surface of the polished free-standing 300 μm thick diamond film using lift-off technology. The performance of the fabricated diamond-based detectors was tested using a241Am alpha particle source with a characteristic energy of 5.5 MeV. Average charge collection efficiency of 52% for detector with narrow inter-electrode spacing of 25 μm and of 32% for detector with wide inter-electrode spacing of 100 μm was obtained, indicating that the detector with narrow inter-electrode has a higher charge collection efficiency than the detector with wide inter-electrode spacing. This should be attributed to fewer boundary trap and recombination centers between electrodes in detector with narrow inter-electrode spacing than that with wide inter-electrode spacing.

Original languageEnglish (US)
Pages (from-to)682-686
Number of pages5
JournalDiamond and Related Materials
Issue number3-7
StatePublished - Mar 2003
Externally publishedYes


  • Alpha particle detector
  • Charge collection efficiency
  • Chemical vapor deposition
  • Diamond properties and applications

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering


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