Patent ID: 7205239

Claim:
A method of manufacturing a semiconductor device, the method comprising: forming a plurality of circuits in a chip forming region defined on a main surface of a semiconductor wafer: grinding a rear surface of the semiconductor wafer; the rear surface being opposite to the main surface; applying surface treatment to the rear surface to achieve a uniform roughness in a back surface that opposes and corresponds to each of the chip forming regions; segmenting the semiconductor wafer so as to separate the chip forming regions from one another, thereby, producing semiconductor chips; laying an electrode formed on the semiconductor chip onto a target object so that a bump is interposed therebetween; and thermo-compressing the electrodes and a target object by applying ultrasonic vibrations thereto from the back surface of the semiconductor chips, thereby bonding the semiconductor chips to the target object via the bumps; wherein the surface treatment is applied in a particular direction corresponding to a direction of the ultrasonic vibration so that a substantially uniform roughness is achieved in the direction of the ultrasonic vibration between the semiconductor chips.