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Semiconductor device and manufacturing method thereof

Image Number 6 for United States Patent #7674658.

A semiconductor device and a manufacturing method thereof are provided. The manufacturing method can form a structure of a thin film transistor (TFT) having a symmetric lightly doped region, and thus provide superior operation reliability and electrical performance. In addition, the manufacturing method forms gate patterns of different TFTs by the same mask process and thereby avoids the misalignment of masks so as to improve the processing yield and reduce the manufacturing cost.

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