Patent ID: 7145120

Claim:
A method comprising: positioning an object that includes an integrated circuit chip and an underfill material for heating within a chamber having an electromagnetic radiation source such that the integrated circuit chip is in contact with an absorbing piece secured by a supporting piece, the supporting piece made of a material transparent to energy from the electromagnetic radiation source; guiding and confining the energy from the electromagnetic radiation source within a guiding enclosure inside the chamber so that all of the energy is guided at the absorbing piece and the object, the guiding enclosure made of a material reflective of the energy from the electromagnetic radiation source; and heating the integrated circuit chip at a faster rate than the underfill material by transferring the energy from the absorbing piece directly to the integrated circuit chip and by having the absorbing piece be made of at least one material that absorbs the energy from the electromagnetic radiation source for transfer to the integrated circuit chip, a predetermined composition of the absorbing piece controlling an energy absorption rate of the absorbing piece.