Abstract
A new poly-crystal silicon thin-film transistor (poly-Si TFT) with a transparent bottom-gate electrode has been fabricated by XeF excimer-laser light irradiation from the glass substrate side. Compared with poly-Si TFTs made by XeF or ArF excimer-laser light irradiation to the top Si surface, the new TFT shows a higher electron mobility of about 100 cm/sup 2//Vs, independent of the Si film thickness. Therefore, poly-Si driver TFTs and amorphous-silicon (a-Si) TFTs for the matrix can be formed with the same channel-etch type bottom-gate structure simultaneously on the same glass substrate by using the same starting materials. This is expected to open the way for making driver monolithic and active matrix liquid crystal displays.
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