Patent ID: 11867497
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 6:
7. The method for measuring a film thickness of a semiconductor device according to claim 5, wherein the reference semiconductor device also has a measurement region, the measurement region is formed by a same process as the main storage region, and a substrate has a one-dimensional structure in the measurement region; wherein the obtaining a distribution parameter of the target film in the main storage region of the reference semiconductor device comprises:
obtaining a third measured spectrogram of the measurement region of the reference semiconductor device;
adjusting a distribution parameter of a target film in the measurement region of the reference semiconductor device based on the third measured spectrogram by using a distribution parameter and a thickness parameter of the substrate and a thickness parameter of the target film in the measurement region of the reference semiconductor device as fixed values, obtaining an adjusted third measured spectrogram, and comparing the adjusted third measured spectrogram with a theoretical spectrogram of the measurement region of the reference semiconductor device;
when a similarity between the adjusted third measured spectrogram and the theoretical spectrogram of the measurement region of the reference semiconductor device is greater than a third preset value, using the distribution parameter corresponding to the adjusted third measured spectrogram as the distribution parameter of the target film in the main storage region of the reference semiconductor device; and
when the similarity between the adjusted third measured spectrogram and the theoretical spectrogram of the measurement region of the reference semiconductor device is less than the third preset value, continuing to adjust the distribution parameter of the target film in the measurement region of the reference semiconductor device, until the similarity between the adjusted third measured spectrogram and the theoretical spectrogram of the measurement region of the reference semiconductor device is greater than the third preset value;
wherein, the third preset value is greater than zero and less than or equal to 1.