Carrier transport and photodetection in heterojunction photodiodes comprising n-type silicon and p-type ultrananocrystalline diamond/hydrogenated amorphous carbon composite films

Shinya Ohmagari, Takanori Hanada, Yuki Katamune, Sausan Al-Riyami, Tsuyoshi Yoshitake

    Research output: Contribution to journalReview articlepeer-review

    10 Citations (Scopus)

    Abstract

    Carrier transport and photodetection in heterojunction photodiodes comprising n-type Si substrates and p-type B-doped ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films were investigated. Their transport model was discussed mainly on the basis of electrical measurements. It was revealed that an a-C:H matrix in UNCD/a-C:H would predominantly be responsible for carrier transportation in the photodiodes. The photodiodes exhibited high external quantum efficiencies of 72 and 23% under 254 and 365nm UV illuminations, respectively. These superior responses might be attributable to the photocarrier generation in UNCD grains accompanied by an efficient carrier transport to the a-C:H matrix.

    Original languageEnglish
    Article number050307
    JournalJapanese journal of applied physics
    Volume53
    Issue number5
    DOIs
    Publication statusPublished - May 2014

    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Physics and Astronomy(all)

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