Patent ID: 7745334

Claim:
A method, comprising: selectively modifying at least one surface characteristic of a first device region and a second device region of a semiconductor device to provide different optical responses in said first and second device regions when irradiated by a radiation of a specified wavelength range; after selectively modifying said at least one surface characteristic, forming a first metal silicide in said first device region at a first reaction temperature created by irradiating said first device region by said radiation of said specified wavelength range; and forming a second metal silicide in said second device region at a second reaction temperature created by irradiating said second device region by said radiation of said specified wavelength range, said first temperature being less than said second temperature, wherein irradiating said first and second device regions comprises irradiating said first and second device regions with a beam of said radiation, and wherein each surface portion irradiated by said beam is irradiated for a time interval of 0.1 seconds or less.