作者: Ji Ping Li , Peter G. Borden
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摘要: An apparatus measures a property of layer (such as the sheet resistance or thermal conductivity by following method: (1) focusing heating beam on region conductive layer, (2) modulating power at predetermined frequency that is selected to be sufficiently low ensure least majority (preferably all) generated heat transfers out heated diffusion, and (3) measuring another (a) reflected region, (b) modulated in phase with modulation beam. When measurement changes more than amount (e.g. 10 %), fabrication process parameter changed return normal.