Taiwan Semiconductor Manufacturing Comp. Ltd.

I-Chung Chang

Kun-Pi Cheng

Tsu-Yu Chu

Kun Pi Cheng

An optical inspection system for detecting defects on the surface of a semiconductor wafer includes two light sources and two light receivers mounted as a common assembly which is rotated such that two curtains of light and corresponding linear photosensor arrays circularly scan the wafer surface. The reflected light is analyzed to determine the presence of surface defects. Marks applied to the wafer surface provide amplitude and timing references used to adjust and synchronize the analyzed signals.

Method and apparatus for inspecting the surface of a semiconductor device

The two dimensional intensity profile of radiation applied to a semiconductor wafer during photolithography is controlled by passing the radiation beam through an attenuating member before the beam is imaged by a mask onto the wafer. The attenuating member is preferably ring shaped and is formed of a semi-transparent material such as Mo Bi Si O , or a material that is partially reflective of the radiation.

Method and apparatus for controlling the dose of radiations applied to a semiconductor wafer during photolithography

A method of overlaying two images and from this overlay observe and measure the accuracy of the alignment of the wafer. Wafer misalignment can be readily corrected based on the results of these observations. Alignment marks are provided on the surface of the wafer that is being validated for accuracy of alignment. The position of this mark relative to a pattern provided on the surface of a control wafer is measured and forms an indication of the alignment of the wafer.

Growing community of inventors

Hsin-Chu, Taiwan

I-Chung Chang