Patent ID: 7951699

Claim:
A method of manufacturing a semiconductor device, comprising: a first step of forming a solder film on metal posts of a mother chip; a second step of forming solder balls after the first step by printing a solder paste on the mother chip and heating the mother chip so that the solder paste is reflowed; a third step of bonding the metal posts of the mother chip and metal posts of a daughter chip to each other in a thermocompression bonding manner by means of the solder film after the second step; and a fourth step of flip-chip-connecting the mother chip on a circuit substrate by using the solder balls, wherein in the second step the mother chip is heated in a nitrogen atmosphere in which the oxygen concentration is 500 ppm or less, and wherein when the metal posts of the mother chip and the metal posts of the daughter chip are bonded in a thermocompression bonding manner by means of the solder film, the daughter chip is heated to a temperature higher than a melting point of the solder film, and a temperature of the mother chip is set lower than a melting point of the solder balls.