| 摘要 |
The present invention provides a semiconductor device and a solar cell, which may be low-cost, highly efficient, safe, and last long. The semiconductor device has a compound semiconductor layer as a window layer including nitride compound semiconductor of at least one element selected from a group of Al, Ga and In and nitrogen, formed on a semiconductor substrate. The solar cell has a compound semiconductor layer containing a nitride compound semiconductor defined by a composition formula AlXGaYNW on a semiconductor substrate, where X, Y, Z and W represent a composition ratio, and satisfy 0.8<=(X+Y+Z)/W<=1.2 and 0.1<=Z/(X+Y+Z)<=1.0.
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