Patent ID: 11967576
Assignee: MICRON TECHNOLOGY, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A system for thermally treating conductive elements on a semiconductor structure, the system comprising:
apparatus for generating a laser beam in an infrared or visible green spectrum, the apparatus configured to selectively adjust a surface area of irradiation;
apparatus for controlling a path of the laser beam operably coupled to the apparatus for generating the laser beam;
an infrared temperature sensor configured to measure a temperature of a surface during irradiation by the laser beam;
a first stencil having first holes sized and positioned to at least substantially align with bond pads of a semiconductor structure, the first stencil configured to enable flux to be deposited on the bond pads and to mask other portions of the semiconductor structure;
a second stencil having second holes sized and positioned to permit discrete masses of conductive element material to pass through the second holes and contact the flux, the second stencil configured to be positioned proximate to the semiconductor structure following removal of the first stencil, the second stencil comprising a material non-wettable by the discrete masses of conductive element material; and
a film supported from an outer rim of a film frame, the film comprising a polymer backing material bearing an adhesive for supporting the semiconductor structure with a surface bearing the discrete masses of conductive element material in the flux, the surface located on a side of the semiconductor structure opposite the film when the semiconductor structure is supported on the film, while the second stencil is located proximate to the surface and while a laser beam generated by the apparatus for generating the laser beam irradiates the surface of the semiconductor structure to reflow at least one of the discrete masses of conductive element material in the flux in response to applied energy from the laser beam, the second stencil further configured as a heat sink to absorb, reflect, or redirect heat from the laser beam,
wherein the apparatus for generating the laser beam, the apparatus for controlling the path of the laser beam, and the infrared temperature sensor are configured to maintain a temperature of the surface irradiated by the laser beam and detectable by the infrared temperature sensor at about 360° C. or less.