Patent ID: 11959737
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method for characterising structures etched in a substrate comprising, for at least one structure etched in said substrate:
an imaging step comprising the following steps:
capturing, with an imaging device positioned on a top surface of said substrate, at least one image of the top surface of said substrate; and
measuring a first data relating to said at least one structure from at least one captured image;

an interferometric measurement step, carried out with a low-coherence interferometer positioned on said top surface, for measuring with a measurement beam positioned on said at least one structure, at least one depth data relating to a depth of said at least one structure; and
a first adjusting step for adjusting said measurement beam according to said first data,
said imaging step and said interferometric measurement step being carried out sequentially so that:
the first data is measured during the imaging step,
then the measurement beam is adjusted according to said first data, and
then the interferometric measurement step is carried out with the adjusted measurement beam.