| 摘要 |
A semiconductor device includes a semiconductor substrate having a first and a second region, a first wiring layer including a lower layer having polycrystal silicon portions including impurities at a high concentration and formed over the first region of the semiconductor substrate via an insulating film. An upper layer of the first wiring layer is a metal silicide having a first film thickness. A second wiring layer includes a lower layer formed over the second region of the semiconductor substrate via an insulating film and is formed of either a non-doped polycrystal portion or a polycrystal silicon portion having a resistivity of at least 10 OMEGAcm. An upper layer of the second wiring layer is a metal silicide portion having a second film thickness thicker than the first film thickness.
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