Patent ID: 7541262

Claim:
A method for producing a semiconductor device the method comprising: growing a group III nitride based compound semiconductor crystal on a substrate; an electrode formation step of forming metal layer electrodes in an islands-pattern on a surface of a semiconductor crystal grown on a crystal growth substrate, the surface being opposite a surface facing the crystal growth substrate, so that each electrode is provided in an area corresponding to a semiconductor device chip; a supporting substrate bonding step of bonding the electrodes to an electrically conductive substrate for supporting the semiconductor crystal by use of a conductive first adhesive; an adhesive charging step of charging a second adhesive comprising a resin into spaces formed between the semiconductor crystal and the supporting substrate through the supporting substrate bonding step at chip separation planes at which the supporting substrate is to be divided into individual chips, after the supporting substrate bonding step, the spaces being immersed in the second adhesive in the form of liquid in a direction perpendicular or non-parallel to the liquid surface; a laser lift-off step of removing the crystal growth substrate from the semiconductor crystal through laser beam radiation; a separation trench formation step of forming separation trenches along the spaces on the surface of the semiconductor crystal which has been exposed through the laser lift-off step; and a separation step of separating the resultant semiconductor wafer into individual chips along the separation trenches.