Electronic structures of B 2p and C 2p levels in boron-doped diamond films studied using soft x-ray absorption and emission spectroscopy

Jin Nakamura, Eiki Kabasawa, Nobuyoshi Yamada, Yasuaki Einaga, Daisuke Saito, Hideo Isshiki, Shigemi Yugo, Rupert C C Perera

Research output: Contribution to journalArticle

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Abstract

X-ray absorption (XAS) and emission (XES) spectroscopy near B K and C K edges have been performed on metallic (∼0.1 at. % B, B-diamond) and semiconducting (∼0.03 at. % B and N, BN-diamond) doped diamond films. Both B K XAS and XES spectra show a metallic partial density of states (PDOS) with the Fermi energy of 185.3 eV, and there is no apparent boron-concentration dependence in contrast to the different electric property. In C K XAS spectrum of B-diamond, the impurity state ascribed to boron is clearly observed near the Fermi level. The Fermi energy is found to be almost same with the top of the valence band of nondoped diamond: EV=283.9 eV. C K XAS of BN-diamond shows both the B-induced shallow level and N-induced deep and broad levels as the in-gap states, in which the shallow level is in good agreement with the activation energy (Ea=0.37 eV) estimated from the temperature dependence of the conductivity; namely, the change in C 2p PDOS of impurity-induced metallization is directly observed. The electric property of this diamond is ascribed mainly to the electronic structure of C 2p near the Fermi level. The observed XES spectra are compared with the discrete variational Xα (DVXα) cluster calculation. The DVXα result supports the strong hybridization between B 2p and C 2p observed in XAS and XES spectra, and suggests that the small amount of boron (≤0.1 at. %) in diamond occupies the substitutional site rather than interstitial site.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number24
DOIs
Publication statusPublished - 2004 Dec

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Diamond
Boron
Diamond films
Emission spectroscopy
diamond films
Absorption spectroscopy
x ray absorption
x ray spectroscopy
Electronic structure
Diamonds
absorption spectroscopy
boron
diamonds
electronic structure
X rays
X ray absorption
Fermi level
spectroscopy
emission spectra
x rays

ASJC Scopus subject areas

  • Condensed Matter Physics

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Electronic structures of B 2p and C 2p levels in boron-doped diamond films studied using soft x-ray absorption and emission spectroscopy. / Nakamura, Jin; Kabasawa, Eiki; Yamada, Nobuyoshi; Einaga, Yasuaki; Saito, Daisuke; Isshiki, Hideo; Yugo, Shigemi; Perera, Rupert C C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 24, 12.2004, p. 1-6.

Research output: Contribution to journalArticle

Nakamura, Jin ; Kabasawa, Eiki ; Yamada, Nobuyoshi ; Einaga, Yasuaki ; Saito, Daisuke ; Isshiki, Hideo ; Yugo, Shigemi ; Perera, Rupert C C. / Electronic structures of B 2p and C 2p levels in boron-doped diamond films studied using soft x-ray absorption and emission spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 70, No. 24. pp. 1-6.
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abstract = "X-ray absorption (XAS) and emission (XES) spectroscopy near B K and C K edges have been performed on metallic (∼0.1 at. {\%} B, B-diamond) and semiconducting (∼0.03 at. {\%} B and N, BN-diamond) doped diamond films. Both B K XAS and XES spectra show a metallic partial density of states (PDOS) with the Fermi energy of 185.3 eV, and there is no apparent boron-concentration dependence in contrast to the different electric property. In C K XAS spectrum of B-diamond, the impurity state ascribed to boron is clearly observed near the Fermi level. The Fermi energy is found to be almost same with the top of the valence band of nondoped diamond: EV=283.9 eV. C K XAS of BN-diamond shows both the B-induced shallow level and N-induced deep and broad levels as the in-gap states, in which the shallow level is in good agreement with the activation energy (Ea=0.37 eV) estimated from the temperature dependence of the conductivity; namely, the change in C 2p PDOS of impurity-induced metallization is directly observed. The electric property of this diamond is ascribed mainly to the electronic structure of C 2p near the Fermi level. The observed XES spectra are compared with the discrete variational Xα (DVXα) cluster calculation. The DVXα result supports the strong hybridization between B 2p and C 2p observed in XAS and XES spectra, and suggests that the small amount of boron (≤0.1 at. {\%}) in diamond occupies the substitutional site rather than interstitial site.",
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AU - Nakamura, Jin

AU - Kabasawa, Eiki

AU - Yamada, Nobuyoshi

AU - Einaga, Yasuaki

AU - Saito, Daisuke

AU - Isshiki, Hideo

AU - Yugo, Shigemi

AU - Perera, Rupert C C

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N2 - X-ray absorption (XAS) and emission (XES) spectroscopy near B K and C K edges have been performed on metallic (∼0.1 at. % B, B-diamond) and semiconducting (∼0.03 at. % B and N, BN-diamond) doped diamond films. Both B K XAS and XES spectra show a metallic partial density of states (PDOS) with the Fermi energy of 185.3 eV, and there is no apparent boron-concentration dependence in contrast to the different electric property. In C K XAS spectrum of B-diamond, the impurity state ascribed to boron is clearly observed near the Fermi level. The Fermi energy is found to be almost same with the top of the valence band of nondoped diamond: EV=283.9 eV. C K XAS of BN-diamond shows both the B-induced shallow level and N-induced deep and broad levels as the in-gap states, in which the shallow level is in good agreement with the activation energy (Ea=0.37 eV) estimated from the temperature dependence of the conductivity; namely, the change in C 2p PDOS of impurity-induced metallization is directly observed. The electric property of this diamond is ascribed mainly to the electronic structure of C 2p near the Fermi level. The observed XES spectra are compared with the discrete variational Xα (DVXα) cluster calculation. The DVXα result supports the strong hybridization between B 2p and C 2p observed in XAS and XES spectra, and suggests that the small amount of boron (≤0.1 at. %) in diamond occupies the substitutional site rather than interstitial site.

AB - X-ray absorption (XAS) and emission (XES) spectroscopy near B K and C K edges have been performed on metallic (∼0.1 at. % B, B-diamond) and semiconducting (∼0.03 at. % B and N, BN-diamond) doped diamond films. Both B K XAS and XES spectra show a metallic partial density of states (PDOS) with the Fermi energy of 185.3 eV, and there is no apparent boron-concentration dependence in contrast to the different electric property. In C K XAS spectrum of B-diamond, the impurity state ascribed to boron is clearly observed near the Fermi level. The Fermi energy is found to be almost same with the top of the valence band of nondoped diamond: EV=283.9 eV. C K XAS of BN-diamond shows both the B-induced shallow level and N-induced deep and broad levels as the in-gap states, in which the shallow level is in good agreement with the activation energy (Ea=0.37 eV) estimated from the temperature dependence of the conductivity; namely, the change in C 2p PDOS of impurity-induced metallization is directly observed. The electric property of this diamond is ascribed mainly to the electronic structure of C 2p near the Fermi level. The observed XES spectra are compared with the discrete variational Xα (DVXα) cluster calculation. The DVXα result supports the strong hybridization between B 2p and C 2p observed in XAS and XES spectra, and suggests that the small amount of boron (≤0.1 at. %) in diamond occupies the substitutional site rather than interstitial site.

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