Patent ID: 6177151
Filing Date: 2001-01-23
Classification: B01J,C23C,C40B,H01L

Abstract:
A method for creating a circuit element for an electronic device, the method comprising the steps of(a) providing a pulsed laser,(b) providing a receiving substrate,(c) providing a target substrate comprising a laser-transparent support having a back surface and a front surface, wherein the front surface has a coating that comprises a transfer material and a matrix material, wherein the transfer material comprises particles of electronic material selected from the group consisting of metal particles, dielectric particles, ferroelectric particles, ferrite particles, ferrimagnetic particles, ferromagnetic particles, phosphor particles, superconductor particles and semiconductor particles, wherein the coating is a colloidal or particulate suspension of the particles of the transfer material in the matrix material, and wherein the matrix material has the property of being or becoming more volatile than the transfer material when exposed to pulsed laser energy,(c) positioning the pulsed laser in relation to the target substrate and exposing the target substrate to pulsed laser energy from the pulsed laser so that the pulsed laser energy is directed through the back surface of the target substrate and through the laser-transparent support to strike the coating at a defined target location with sufficient energy to volatilize the matrix material at the location, causing the coating to desorb from the location and be lifted from the surface of the support,(d) positioning the receiving substrate in a spaced relation to the target substrate so that the particles of the transfer material in the desorbed coating are deposited at a defined receiving location on the receiving substrate, and(e) repeating steps (c) and (d) at successive defined target locations and successive defined receiving locations so that the deposited particles of transfer material form a connected deposit of transfer material wherein the transfer material in the deposit is better connected or bonded than was the transfer material in the coating on the laser transparent support and wherein the deposit is patterned to form an electronic circuit element, andwherein steps (c), (d) and (e) are carried out at room temperature and atmospheric pressure.