Faculty Profiles - ASAHI Ryoji

Papers - ASAHI Ryoji

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First Principles Calculations of Auger Recombination and Impact Ionization Rates in Semiconductors Reviewed

Picozzi S., Asahi R., Freeman A. J.

JOURNAL OF COMPUTATIONAL ELECTRONICS Vol. 2 ( 2-4 ) page： 197 - 202 2003.12

Growth of In2O3(ZnO)(5) platelet micro-crystals by flux methods Reviewed

Xia CT, Asahi R, Tani T

JOURNAL OF CRYSTAL GROWTH Vol. 254 ( 1-2 ) page： 144 - 150 2003.6

Characterization of Nitrogen-doped Titanium Oxide Photocatalyst Activated by Visible-light Reviewed

OHWAKI Takeshi, MORIKAWA Takeshi, AOKI Koyu, ASAHI Ryoji, TAGA Yasunori, ISOMURA Noritake

Hyomen Kagaku Vol. 24 ( 1 ) page： 25 - 30 2003.1

Language：Japanese Publishing type：Research paper (other academic) Publisher：The Surface Science Society of Japan

N-doped titanium oxide photocatalyst is found to be activated by visible light irradiation as well as ultraviolet irradiation. We evaluated its crystal structure, N states in the lattice, composition, and surface morphology using X-ray diffiraction (XRD), X-ray photoemission spectroscopy (XPS), and scanning probe microscopy (SPM). As a result, it is found that the materials have rutile or anatase crystal structure with nitrogen doped into substitutional sites of oxygen in TiO<Sub>2</Sub>, which contributes band gap narrowing. It is also confirmed that XPS measurement was influenced by surface treatment such as Ar ion bombardment.

DOI： 10.1380/jsssj.24.25

Accurate first-principles detailed-balance determination of Auger recombination and impact ionization rates in semiconductors Reviewed

Picozzi S, Asahi R, Geller CB, Freeman AJ

PHYSICAL REVIEW LETTERS Vol. 89 ( 19 ) 2002.11

Impact Ionization in GaAs within A Screened Exchange Density Functional Formalism Reviewed

Picozzi S.

Journal of Computational Electronics Vol. 1 ( 3 ) page： 421 - 424 2002.10

First-principles calculations for understanding high conductivity and optical transparency in InxCd1-x films Reviewed

Asahi R, Wang A, Babcock JR, Edleman NL, Metz AW, Lane MA, Dravid VP, Kannewurf CR, Freeman AJ, Marks TJ

THIN SOLID FILMS Vol. 411 ( 1 ) page： 101 - 105 2002.5

Surface properties of the refractory metal-nitride semiconductor ScN: Screened-exchange LDA-FLAPW investigations Reviewed

Stampfl C, Asahi R, Freeman AJ

PHYSICAL REVIEW B Vol. 65 ( 16 ) page： 1 - 4 2002.4

Impact ionization in GaAs: A screened exchange density-functional approach Reviewed

Picozzi S, Asahi R, Geller CB, Continenza A, Freeman AJ

PHYSICAL REVIEW B Vol. 65 ( 11 ) page： 1 - 4 2002.3

Photocatalysts sensitive to visible light - Response Reviewed

Asahi R, Morikawa T, Ohwaki T, Aoki K, Taga Y

SCIENCE Vol. 295 ( 5555 ) page： 627 - 627 2002.1

Electronic structure of misfit-layered calcium cobaltite Reviewed

Asahi R, Sugiyama J, Tani T, Xia CT

XXI INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT '02 page： 203 - 206 2002

Excited states and optical properties entirely from first principles: Extended FLAPW method and its graphical user interface Reviewed

Kim MY, Asahi R, Freeman AJ

JOURNAL OF COMPUTER-AIDED MATERIALS DESIGN Vol. 9 ( 3 ) page： 173 - 201 2002

Electronic structure of misfit-layered calcium cobaltite Reviewed

Asahi R., Sugiyama J., Tani T.

Physical Review B - Condensed Matter and Materials Physics Vol. 66 ( 15 ) page： 1 - 7 2002

Electronic structure of misfit-layered calcium cobaltite Reviewed

Asahi R.

International Conference on Thermoelectrics, ICT, Proceedings Vol. 2002-January page： 203 - 206 2002

Effect of GGA on the half-metallicity of the itinerant ferromagnet CoS2 Reviewed

Shishidou T, Freeman AJ, Asahi R

PHYSICAL REVIEW B Vol. 64 ( 18 ) 2001.11

Electronic structure and small polaron hole transport of copper aluminate Reviewed

Ingram BJ, Mason TO, Asahi R, Park KT, Freeman AJ

PHYSICAL REVIEW B Vol. 64 ( 15 ) 2001.10

Computational band-structure engineering of III-V semiconductor alloys Reviewed

Geller CB, Wolf W, Picozzi S, Continenza A, Asahi R, Mannstadt W, Freeman AJ, Wimmer E

APPLIED PHYSICS LETTERS Vol. 79 ( 3 ) page： 368 - 370 2001.7

Visible-light photocatalysis in nitrogen-doped titanium oxides Reviewed

Asahi R, Morikawa T, Ohwaki T, Aoki K, Taga Y

SCIENCE Vol. 293 ( 5528 ) page： 269 - 271 2001.7

Indium-cadmium-oxide films having exceptional electrical conductivity and optical transparency: Clues for optimizing transparent conductors Reviewed

Wang A, Babcock JR, Edleman NL, Metz AW, Lane MA, Asahi R, Dravid VP, Kannewurf CR, Freeman AJ, Marks TJ

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Vol. 98 ( 13 ) page： 7113 - 7116 2001.6

Band-Gap Narrowing of Titanium Dioxide by Nitrogen Doping Reviewed

Morikawa Takeshi, Asahi Ryoji, Ohwaki Takeshi, AOKI Koyu, TAGA Yasunori

Japanese journal of applied physics. Pt. 2, Letters Vol. 40 ( 6 ) page： L561 - L563 2001.6

Electronic structure and physical properties of early transition metal mononitrides: Density-functional theory LDA, GGA, and screened-exchange LDA FLAPW calculations Reviewed

Stampfl C, Mannstadt W, Asahi R, Freeman AJ

PHYSICAL REVIEW B Vol. 63 ( 15 ) 2001.4

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Papers - ASAHI Ryoji