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, Jingqi 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 1 2003


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

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Chemistry(all)
    • Mechanical Engineering
    • Materials Chemistry
    • Electrical and Electronic Engineering


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