Patent ID: 7935940

Claim:
An ultraviolet (UV) apparatus for semiconductor processing, the apparatus comprising: (a) a process chamber comprising a substrate holder and a window; and, (b) a UV radiation assembly external to the process chamber, the assembly comprising i) at least two UV lamps, ii) one or more reflectors operable to direct a portion of the UV radiation from the at least two UV lamps through the window towards the substrate holder, iii) an in situ UV intensity detector disposed between the at least two UV lamps, and iv) a shutter or iris configured to isolate the UV intensity detector from the UV radiation between measurements; and, (c) a controller configured to execute a set of instructions, the set of instructions comprising: opening the shutter or iris to expose a UV detector to the UV radiation; measuring a UV intensity at a UV radiation power with the UV detector; after measuring, closing a shutter or iris to isolate the UV detector from the UV radiation; calculating a deviation based on the measurement and a baseline intensity; and, adjusting the UV radiation power or exposure duration to compensate for the deviation.