Abstract: An electrical-supply-free MOS integrated circuit is described. The circuit comprises: a first semiconductor device having a first current terminal, a first input voltage terminal, and a first common terminal, said semiconductor device having a voltage between said first input voltage terminal and said first common terminal that controls a current flow leaving said first current terminal; and a first opto-electronic device having a first anode connected to said first current terminal and a first cathode connected to a ground to convert an input of incident light into an electrical signal, said first opto-electronic device having photodiode and photovoltaic cell capabilities; wherein a voltage is set between a node of said first current terminal and said first common terminal. The principle of the circuit operation can be used for developing optically controlled electrical-supply-free very large scale integrated circuits (VLSI) at low-cost.