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We report on the degenerate doping of a silicon resonator as a new method for reducing its temperature coefficient of frequency (TCF). This is the first TCF reduction technique reported till date that takes advantage of free charge carrier effects on the elastic constants of silicon. The TCF of silicon bulk acoustic resonators (SiBAR) are reduced from -29 ppm/??C to -1.5 ppm/??C on 5 ??m thick devices...
Recently, the mono- and the multicrystalline (mc) silicon wafer technology have dominated the photovoltaic market because of its advantage of conversion efficiency, reliability and cost in comparison with other technology. Especially the market share of mc-Si solar cell seems to be more than 50% in 2002. We have been investigating the mc-Si photovoltaic solar cells to reduce the cost for many years...
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