Patent ID: 7588990

Claim:
A process for forming semiconductor junctions in a wafer, comprising: ion implanting dopant impurity atoms into the surface of the wafer; depositing an amorphous carbon layer on said wafer by the following steps: (a) introducing the wafer into a reactor chamber and introducing a hydrocarbon process gas into the chamber; (b) inductively coupling RF plasma source power into the chamber and applying RF plasma bias power to the wafer, (c) setting said bias power in a range between about 2 kW and 3 kW and setting said total source power in a range centered around 4 kW while maintaining pressure in said chamber in a range of 3 mTorr to 2 Torr to deposited an amorphous carbon layer on said wafer having an extinction coefficient in excess of 0.3 for light in a wavelength range that includes a laser wavelength; and generating a line beam from an array of CW lasers operating at said laser wavelength and annealing the implanted dopant atoms in the wafer surface by scanning the line beam across the wafer surface in a direction transverse to the line beam, said line beam having sufficient power to raise the wafer surface temperature in the zone of said line beam above 1150 to 1350 degrees C. for 50 microsec to 3 millisec.