Patent ID: 8778748

Claim:
A method for manufacturing a semiconductor device comprising: forming a source electrode and a drain electrode on a front face of a semiconductor substrate which is transparent to visible light and which has opposed front and back faces; forming a front-side gate electrode between the source electrode and the drain electrode on the front face of the semiconductor substrate; forming an aligning mark on the front face of the semiconductor substrate at a location other than between the source electrode and the drain electrode; from the back face of the semiconductor substrate, aligning the semiconductor substrate with respect to the source, front-side gate, and drain electrodes, using the aligning mark by observing the alignment mark through the semiconductor substrate; and forming a back-side gate electrode on the back face of the semiconductor substrate at a location directly opposite the front-side gate electrode, based on the aligning of the semiconductor substrate with respect to the source, front-side gate, and drain electrodes, using the aligning mark.