Patent ID: 8381966

Claim:
A method of bonding substrates having different coefficients of thermal expansion, said method comprising: bonding an array of solder material portions to one of a first substrate and a second substrate; mounting said first substrate to a bonder head and said second substrate to a base plate; heating said second substrate to a first temperature and heating said first substrate to a second temperature, wherein said first temperature and second temperature do not exceed melting temperature of solder material portions in said array; bringing said array of solder material portions into physical contact with the other of said first substrate and said second substrate while said first substrate is maintained at said second temperature and said second substrate is held at said first temperature; heating said array of solder material portions to a third temperature that exceeds a melting temperature of said array of solder material portions, wherein thermal expansion of said second substrate substantially matches thermal expansion of said first substrate while said first substrate is at said third temperature and said second substrate is maintained at said first temperature, wherein said array of solder material portions is bonded to said first substrate and said second substrate upon cooling of said array of solder material portions; and dismounting a bonded structure including said first substrate and said second substrate from said bonder head after said array of solder material portions cools down to a fourth temperature lower than said second temperature.