Patent ID: 8191758
Filing Date: 2012-06-05
Classification: B23K,H01L,Y10T

Abstract:
1. A method for manufacturing a semiconductor device, comprising: stacking a second substrate having second solder bumps on a first substrate having first solder bumps while temporarily tacking the first solder bumps and the second solder bumps; disposing a stack of the first substrate and the second substrate, in which the first solder bumps and the second solder bumps are temporarily tacked, inside a furnace; exhausting gas in the furnace where the stack is disposed to be in a reduced pressure atmosphere; introducing a carboxylic acid gas into the furnace in the reduced pressure atmosphere; increasing a temperature inside the furnace where the carboxylic acid gas is introduced to a temperature in a range from a reduction temperature of oxide films on the first and second solder bumps by the carboxylic acid gas to lower than a melting temperature of the first and second solder bumps, so as to reduce and remove the oxide films formed on surfaces of the first and second solder bumps, including oxide films caught in between the temporarily tacked first solder bumps and second solder bumps, by the carboxylic acid gas introduced into the furnace; exhausting gas in the furnace to be in a reduced pressure atmosphere at the temperature in the range from the reduction temperature of the oxide films to lower than the melting temperature of the first and second solder bumps, so as to discharge the carboxylic acid gas and gas generated by the reduction of the oxide films outside the furnace before increasing a temperature inside the furnace up to a temperature in a range of the melting temperature of the first and second solder bumps and higher; and joining the first solder bumps and the second solder bumps by increasing a temperature inside the furnace in the reduced pressure atmosphere up to a temperature in a range of the melting temperature of the first and second solder bumps and higher, and melting the first and second solder bumps.