Journal of the Ceramic Society of Japan
Paper
112 [11] 599603 (2004)
^óOGLV}vðp¢½yqh|VUÉæé
VJÌ`¬
·ÀNOEcüEÁ¡çqEi¡LFÞ
_Þì§YÆZp¤C2430435 _Þì§CV¼sº¡ò 7051
Þ
(L)R^~l[VERg[ET[rXC2291134 _Þì§Í´sºãò 5293
Formation of Silica Coatings from Perhydropolysilazane Using
Vacuum Ultraviolet Excimer Lamp
Yasuhiro NAGANUMA, Satomi TANAKA, Chihiro KATO and Toyohiko SHINDOÞ
Kanagawa Industrial Technology Research Institute, 7051, Shimoimaizumi, Ebinashi, Kanagawa
Þ
Contamination Control Services, 5293, Shimokuzawa, Sagamiharashi, Kanagawa 2291134
2430435
Silica coatings have been prepared by the spincoating technique with the 172 nm vacuum ultraviolet (VUV) ir
radiation using a Xe2Þexcimer lamp. Perhydropolysilazane was used as a precursor. The chemical states, compo
sition and optical transmittance of VUVirradiated films were investigated by Fourier transform infrared, Xray
photoelectron, UVvisible absorption spectroscopies. The results showed that VUV irradiation was effective to
remove hydrogen and nitrogen from the coating film and to incorporate oxygen to the film, so that the film
transforms into silica. The effects of VUV treatment on the film were found to be dependent on oxygen concen
tration in surrounding gas. It was suggested that the effect of oxidation reaction due to active oxygen species
and/or ozone is larger than that of the cleavage of a chemical bonding by photon energy.
[Received June 4, 2004; Accepted September 22, 2004]
Keywords : Perhydropolysilazane, Silica, Thin film, Spincoating, Vacuum ultraviolet light, Excimer lamp
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Fig. 1. Schematic diagram of the VUV irradiation apparatus.
B. À
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ÉÍ3370, 2160, 840 cm|1 tßÉ»ê¼êCNH, SiH, SiN
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Fig. 2. FTIR spectra of spincoated films dried, heattreated and
VUVirradiated. TH is heat treatment temperature. CO and D are oxy
gen concentration and distance between the lamp window and the
sample, respectively.
ª©Á½D±êÍCi3)`(5)®É¦µ½ O(1Djâ O3 Éæé_
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XyNgð¦·D300
CÅMµ½©çÍCC Æ O, Si
ÌÙ©ÉCN ªÏª³ê½DܽCD20 mm ÅõÆËµ
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Journal of the Ceramic Society of Japan
112 [11] 2004
601
Fig. 3. O1s, N1s and Si2p XPS spectra from spincoated films heattreated and VUVirradiated. TH is heat treatment temperature. CO and D are
oxygen concentration and distance between the lamp window and the sample, respectively.
Fig. 4. XPS depth profiles of spincoated films heattreated and VUVirradiated. TH is heat treatment temperature. CO and D are oxygen con
centration and distance between the lamp window and the sample, respectively.
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i6)®æèàÆß½CÆËµÍCª CO2÷ é¢Í20÷ÌÆ
«ÌÆË£Éηé VUV õ̧ߦð}Uɦ·D±êæ
èCD2 mm Å CO20÷ÌêÆCD20 mm Å CO2÷Ì
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Fig. 5. Optical transmittance spectra of spincoated films heattreat
ed and VUVirradiated. TH is heat treatment temperature. CO and D
are oxygen concentration and distance between the lamp window and
the sample, respectively.
Fig. 6. Calculated values of transmittance of vacuum ultraviolet
light as a function of distance with oxygen concentration (CO) of 2÷
and 20÷ by Eq. (6).
FTIR ªèÌÊ©çCD20 mm ÌðÌÆ«CCO2÷,
20÷ÌoûÌðÅVJÖÌ]»ªÏª³ê½Dµ©µCCO
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