Intense blue–white luminescence from carbon-doped silicon-rich silicon oxide
نویسندگان
چکیده
The effect of carbon doping on the enhancement of visible luminescence from silicon-rich silicon oxide ~SRSO!, which consists of Si nanoclusters embedded inside a SiO2 matrix, is investigated. C-doped SRSO films were fabricated by electron cyclotron resonance-plasma enhanced chemical vapor deposition method using SiH4 , O2 , and CH4 source gases followed by a high-temperature anneal. Intense blue-white visible luminescence, visible to the naked eye under daylight conditions, was observed from the film with a nearly equal amount of C and excess Si ~;16 at. %! after an anneal at 950 °C. Furthermore luminescence could be tuned from 1.8 to 2.5 eV by controlling the C to excess Si ratio, the C content, and the anneal temperature. Taken together with the infrared absorption spectra, these results indicate that the luminescence is attributed to exciton recombination in C-incorporated Si nanoclusters. © 2004 American Institute of Physics. @DOI: 10.1063/1.1645989#
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