The solar cell array produces electromotive force in response to incident light to drive MOSFET gates for use as a semiconductor relay. The manufacture of a crystalline silicon semiconductor used as a solar cell for the semiconductor relay requires too many mask patterns and complicated processes. This involves difficulties in device integration and thin-film formation, resulting in an increase in the cost. The invention provides a solar cell where a great number of semiconductor cells of amorphous silcion are connected in series to drive MOSFEt gates.
