Influence of the crystalline structure on the electrical properties of CVD diamond films

C. Jany, F. Foulon, P. Bergonzo, A. Brambilla, F. Silva, A. Gicquel, T. Pochet

    Research output: Contribution to journalArticlepeer-review

    9 Scopus citations

    Abstract

    〈100〉 〈110〉 and non-textured polycrystalline diamond films were deposited by microwave plasma enhanced chemical vapour deposition. Resistive devices with coplanar and sandwich electrical contacts were made to characterise and compare these films towards their use as radiation detector. Current-voltage measurements in the dark and under UV light and X-ray radiation were carried out. The crystalline structure of the film is shown to have a significant influence on its electrical properties and on their sensitivity to UV and X-ray radiation. Film bulk resistivities range from 1 × 1012 for the 〈100〉 textured films to 5 × 1014 Ω cm for the 〈110〉 textured films. We found that the 〈100〉 textured film has the highest carrier drift length before trapping (μτE, where μ and τ are the carrier mobility and lifetime and E is the applied electric field) while the non-textured film has the lowest μτE. The presence of nitrogen in a 〈100〉 textured film is shown to increase its resistivity by more than two orders of magnitude owing to compensation effect, but it reduces the carrier drift length before trapping by a factor of 2.

    Original languageBritish English
    Pages (from-to)741-746
    Number of pages6
    JournalDiamond and Related Materials
    Volume5
    Issue number6-8
    DOIs
    StatePublished - May 1996

    Keywords

    • CVD diamond films
    • Electrical properties

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