Spectral absorption properties of ultrananocrystalline diamond/amorphous carbon composite thin films prepared by pulsed laser deposition

Tsuyoshi Yoshitake; Akira Nagano; Masara Itakura; Noriyuki Kuwano; Takeshi Hara; Kunihito Nagayama

doi:10.1143/JJAP.46.L936

Spectral absorption properties of ultrananocrystalline diamond/amorphous carbon composite thin films prepared by pulsed laser deposition

Tsuyoshi Yoshitake, Akira Nagano, Masara Itakura, Noriyuki Kuwano, Takeshi Hara, Kunihito Nagayama

Materials Physics and Engineering

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

The spectral absorption properties of ultrananocrystalline diamond (UNCD)/amorphous carbon composite films grown by pulsed laser deposition with graphite were experimentally investigated. The indirect optical band gaps estimated from the absorption spectrum were 1.0 eV and approximately 5.65 eV, which correspond to those for the amorphous carbon surrounding the UNCDs and for UNCDs themselves, respectively. In addition, the spectrum revealed a direct gap having a value of approximately 2.2 eV. One probable origin can be the presence of grain boundaries between UNCDs and amorphous carbon since they are specific to UNCD/amorphous carbon; further, its appearance is consistent with the theoretical predictions.

Original language	English
Pages (from-to)	L936-L938
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	46
Issue number	36-40
DOIs	https://doi.org/10.1143/JJAP.46.L936
Publication status	Published - Oct 12 2007

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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Spectral absorption properties of ultrananocrystalline diamond/amorphous carbon composite thin films prepared by pulsed laser deposition. / Yoshitake, Tsuyoshi; Nagano, Akira; Itakura, Masara; Kuwano, Noriyuki; Hara, Takeshi; Nagayama, Kunihito.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 46, No. 36-40, 12.10.2007, p. L936-L938.

Research output: Contribution to journal › Article › peer-review

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AU - Hara, Takeshi

AU - Nagayama, Kunihito

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Spectral absorption properties of ultrananocrystalline diamond/amorphous carbon composite thin films prepared by pulsed laser deposition

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