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Journal Articles

Size and dopant-concentration dependence of photoluminescence properties of ion-implanted phosphorus- and boron-codoped Si nanocrystals

Nakamura, Toshihiro*; Adachi, Sadao*; Fujii, Minoru*; Sugimoto, Hiroshi*; Miura, Kenta*; Yamamoto, Shunya

Physical Review B, 91(16), p.165424_1 - 165424_8, 2015/04

 Times Cited Count:13 Percentile:57.42(Materials Science, Multidisciplinary)

Semiconductor nanocrystals have unique electrical and optical properties, because of the quantum confinement effect, and the doping of impurities into nanocrystals. In this study, we investigated the photoluminescence (PL) properties of phosphorus- (P) and boron- (B) co-doped Si nanocrystals (Si NCs), which was synthesized using an ion implantation technique. The Si-NC size (average diameter: 3.5, 4.4, 5.2 nm) and the P and B ion doses (0.1-4.5$$times$$10$$^{16}$$ cm$$^{-2}$$)values were systematically varied. We find that the PL peak energy shifts to lower values with increasing the average diameters of Si NCs and PB ion dose. The results of PL measurements indicate that the PL spectra are due to the band-to-band transition at the reduced Si-NC band gap caused by the formation of impurity and the radiative transitions between defect- and/or impurity-related localized states. It was found that the PL properties can be controlled by varying the Si-NC size as well as the dopant concentration.

Journal Articles

Phosphorus and boron codoping of silicon nanocrystals by ion implantation; Photoluminescence properties

Nakamura, Toshihiro*; Adachi, Sadao*; Fujii, Minoru*; Miura, Kenta*; Yamamoto, Shunya

Physical Review B, 85(4), p.045441_1 - 045441_7, 2012/01

 Times Cited Count:24 Percentile:72.65(Materials Science, Multidisciplinary)

Silicon nanocrystals (Si-nc's) such as nanometer-sized Si dots embedded in a SiO$$_{2}$$ matrix and porous Si have been intensively investigated because of their interesting photoluminescence (PL) properties. Si-nc's exhibit strong and visible emission at room temperature. Because of their compatibility with Si-based technology, light-emitting Si-nc's are an attractive candidate for materials used in various optoelectronic device applications. In this study, the PL properties of n- and p-type dopants phosphorus (P) and boron (B) co-doped Si-nc's prepared by the ion implantation were studied. For (P, B) co-doped Si-nc's, the donor-acceptor (D-A)-pair recombination emission was clearly observed on the long-wavelength side of the intrinsic Si-nc emission. The D-A-pair recombination energy is found to be smaller than the band-gap energy of bulk Si and is strongly dependent on the number of P and B impurities doped in a Si-nc's.

JAEA Reports

Feasibility Study on Commercialization of Fast Breeder Reactor Cycle Systems Interim Report of Phase II; Technical Study Report for Reactor Plant Systems

Konomura, Mamoru; Ogawa, Takashi; Okano, Yasushi; Yamaguchi, Hiroyuki; Murakami, Tsutomu; Takaki, Naoyuki; Nishiguchi, Youhei; Sugino, Kazuteru; Naganuma, Masayuki; Hishida, Masahiko; et al.

JNC TN9400 2004-035, 2071 Pages, 2004/06

JNC-TN9400-2004-035.pdf:76.42MB

The attractive concepts for Sodium-, lead-bismuth-, helium- and water-cooled FBRs have been created through using typical plant features and employing advanced technologies. Efforts on evaluating technological prospects of feasibility have been paid for these concepts. Also, it was comfirmed if these concepts satisfy design requierments of capability and performance presumed in the feasibilty study on commertialization of Fast Breeder Reactor Systems. As results, it was concluded that the selection of sodium-cooled reactor was most rational for practical use of FBR technologies in 2015.

Journal Articles

Numerical simulation on generation of inflammable gases by chemical reaction of high temperature steam and wall composition material

Takase, Kazuyuki; Ose, Yasuo*; Fujii, Sadao*

Dai-17-Kai Suchi Ryutai Rikigaku Shimpojiumu Koen Yoshishu, p.B2_2_1 - B2_2_4, 2003/12

no abstracts in English

Journal Articles

Numerical simulation on chemical reaction behavior between injected vapor and carbon material under high temperature environment

Takase, Kazuyuki; Ose, Yasuo*; Fujii, Sadao*; *

Nihon Oyo Suri Gakkai 2002-Nendo Nenkai Koen Rombunshu (Internet), 7 Pages, 2002/00

no abstracts in English

Journal Articles

Numerical simulation of radiative effects in the laser-produced plasma

Utsumi, Takayuki*; Sasaki, Akira; Kunugi, Tomoaki*; Fujii, Sadao*; Akamatsu, Mikio*

Proceedings of 4th International Conference on Supercomputing in Nuclear Applications (SNA 2000) (CD-ROM), 10 Pages, 2000/09

no abstracts in English

Journal Articles

Simulation of solid irradiated with high power ultrashort pulse laser; The behavior of laser beam propagating in the plasma

Utsumi, Takayuki*; Sasaki, Akira; Fujii, Sadao*

Keisan Kogaku Koenkai Rombunshu, 5, 4 Pages, 2000/05

no abstracts in English

Journal Articles

Numerical simulation of thin foils irradiated by ultrashort pulse laser

Utsumi, Takayuki*; Sasaki, Akira; Kunugi, Tomoaki*; Fujii, Sadao*; Akamatsu, Mikio*

Proceedings of 13th International Conference on High-Power Particle Beams (BEAMS 2000) (CD-ROM), 4 Pages, 2000/00

no abstracts in English

Journal Articles

Visualization of exchange flows through breaches of a vacuum vessel in a fusion reactor under the LOVA condition

Takase, Kazuyuki; Kunugi, Tomoaki; Fujii, Sadao*; Shibazaki, Hiroaki*

Flow Visualization Image Process. 1997, 1(00), p.185 - 190, 1997/00

no abstracts in English

Journal Articles

Numerical analysis of buoyancy-driven exchange flow with regard to an HTTR air ingress accident

Fumizawa, Motoo; Kunugi, Tomoaki; Hishida, Makoto; *; Fujii, Sadao*; Igarashi, Minoru*

Nuclear Technology, 110, p.263 - 272, 1995/05

 Times Cited Count:4 Percentile:44.44(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Development of core thermal-hydraulics module for intelligent reactor design system (IRDS)

Kugo, Teruhiko; Fujii, Sadao*; Nakakawa, Masayuki

JAERI-Data/Code 94-001, 187 Pages, 1994/08

JAERI-Data-Code-94-001.pdf:7.51MB

no abstracts in English

Journal Articles

Evaluation of core thermal and hydraulic characteristics of HTTR

Maruyama, So; Fujimoto, Nozomu; Sudo, Yukio; Murakami, Tomoyuki*; Fujii, Sadao*

Nucl. Eng. Des., 152, p.183 - 196, 1994/00

 Times Cited Count:11 Percentile:70

no abstracts in English

Journal Articles

Evaluation of hot spot factors for thermal and hydraulic design of HTTR

Maruyama, So; Yamashita, Kiyonobu; Fujimoto, Nozomu; Murata, Isao; Sudo, Yukio; Murakami, Tomoyuki*; Fujii, Sadao*

Journal of Nuclear Science and Technology, 30(11), p.1186 - 1194, 1993/11

 Times Cited Count:7 Percentile:69.12(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Visualization of buoyancy-driven exchange flow in an enclosure by numerical simulation

Fujii, Sadao*; *; Fumizawa, Motoo; Kunugi, Tomoaki; Hishida, Makoto

Kashika Joho Gakkai-Shi, 13(SUPPL.1), p.257 - 260, 1993/07

no abstracts in English

Journal Articles

Numerical analysis of buoyancy-driven exchange flow with regard to an HTTR air ingress accident

Fujii, Sadao*; *; Igarashi, Minoru*; Fumizawa, Motoo; Kunugi, Tomoaki; Hishida, Makoto

Proc. of the 6th Int. Topical Meeting on Nuclear Reactor Thermal Hydraulics,Vol. 2, p.1498 - 1505, 1993/00

no abstracts in English

Journal Articles

Design window search based on AI technique

Nakakawa, Masayuki; Fujii, Sadao*; *; *

Journal of Nuclear Science and Technology, 29(11), p.1116 - 1119, 1992/11

no abstracts in English

Journal Articles

Numerical study on buoyancy-driven exchange flow in an enclosure

*; Fujii, Sadao*; Fumizawa, Motoo; Kunugi, Tomoaki; Hishida, Makoto

Proc. of the 2nd JSME-KSME Thermal Engineering Conf. Vol. 1, p.1-7 - 1-12, 1992/00

no abstracts in English

Journal Articles

Experimental and theoretical investigations on heat transfer of strongly heated turbulent gas flow in an annular duct

Fujii, Sadao*; Akino, Norio; Hishida, Makoto; *; Sanokawa, Konomo

JSME Int. J., Ser. 2, 34(3), p.348 - 354, 1991/00

no abstracts in English

Journal Articles

Determination of hot spot factors for thermal and hydraulic design of High Temperature Engineering Test Reactor (HTTR)

Maruyama, So; Murakami, Tomoyuki*; Fujii, Sadao*; Fujimoto, Nozomu; Tanaka, Toshiyuki; Sudo, Yukio; Saito, Shinzo

Proc. of the 1st JSME/ASME Joint Int. Conf. on Nuclear Engineering,Vol. 1, p.425 - 430, 1991/00

no abstracts in English

JAEA Reports

Analysis method of the coated fuel particle failure and fractional release from fuel elemeuts of HTTR

Sawa, Kazuhiro; Fujii, Sadao*; Shiozawa, Shusaku;

JAERI-M 88-258, 45 Pages, 1988/12

JAERI-M-88-258.pdf:0.95MB

no abstracts in English

23 (Records 1-20 displayed on this page)