Quantum size effect of ZnSe microcrystal-doped SiO 2 glass thin films prepared by RF-sputtering method
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Quantum size effect of ZnSe microcrystal-doped SiO2 glass thin films prepared by RF-sputtering method Masayuki Hayashi Hirao Active Glass Project, ERATO, JST, Keihanna-Plaza, 1-7 Hikaridai, Seika-cho, Kyoto 619-02, Japan
Takafumi Iwano, Hiroyuki Nasu, and Kanichi Kamiya Department of Chemistry for Materials, Faculty of Engineering, Mie University, Kamihama-cho 1515, Tsu, Mie 514, Japan
Naoki Sugimoto Hirao Active Glass Project, ERATO, JST, Keihanna-Plaza, 1-7 Hikaridai, Seika-cho, Kyoto 619-02, Japan
Kazuyuki Hirao Hirao Active Glass Project, ERATO, JST, Keihanna-Plaza, 1-7 Hikaridai, Seika-cho, Kyoto 619-02, Japan and Division of Material Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo-ku Kyoto 606-01, Japan (Received 14 December 1996; accepted 14 March 1997)
Semiconductor ZnSe microcrystal-doped SiO2 glass thin films were prepared by the RF-magnetron sputtering method. The particle size of ZnSe microcrystals in the films depended on sputtering conditions such as input power, substrate temperature, and relative surface area ratio (ZnSeySiO2 ) in the target. The blue shift of the optical absorption edge was observed in these glass films. This blue shift energy was explained in terms of the independent confinement of electrons and positive holes, Coulomb force and the influence of a collapsed exciton and the dielectric constant of the matrix glass being taken into consideration.
I. INTRODUCTION 1
Since Jain and Lind first reported large third-order optical susceptibility, x (3) , for the CdSx Se 12x -doped glass, the semiconductor microcrystal-doped glass is one of the leading candidates for nonlinear optical materials. For example, large third-order optical nonlinearity was reported by many studies for various glasses doped with semiconductor microcrystals such as CdS,2,3 CdSe,4–6 CdTe,7,8 CuCl,9,10 and PbS.11 Furthermore, many studies have been carried out to evaluate the usefulness of this type of glass in optical functional devices, such as optical switches, shutters, and waveguides. In particular, since Yumoto et al.12 found the optical bistability with a response time of the order of tens of picoseconds in a semiconductor-doped glass, the study on such doped glasses has been further stimulated. The increase of x (3) in the semiconductor microcrystals compared with bulk semiconductors is expected to arise from the quantum size effect, i.e., the increase of the oscillator strength and the concentration of an applied electromagnetic field in the microcrystals. And, fast relaxation time is assumed to result from the fast recombination of the electron and hole in the very limited space of the particles. 2552
http://journals.cambridge.org
J. Mater. Res., Vol. 12, No. 10, Oct 1997
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Jerominek et al.13 first prepared semiconductor microcrystal-doped glass film by the sputtering method. The sputtering method has the following advantages in preparing such glass films: (1) Glass films containing a high amount of semiconductor
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