Patent ID: 11942379
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An inspection method for detecting a defective bonding interface in a sample substrate comprising at least one element disposed on a support, a bonding interface being defined between the at least one element and a main face of the support, an outer surface of the at least one element being exposed on a front side of the sample substrate and defining, at least in part, an exposed surface of the sample substrate, the inspection method comprising:
placing the sample substrate in a measurement system;
establishing, with the measurement system, an inclination map of the exposed surface, the inclination map comprising a plurality of local inclination measurements relative to a reference surface corresponding to the main face of the support;
analyzing the inclination map, the analyzing comprising:
calculating inclinations of predefined zones of the exposed surface, an inclination of a zone being a representative value of a local inclination measurement associated with the zone;
identifying among the predefined zones at least one identified zone having an inclination deviating by more than a given threshold from the inclination of the reference surface; and

detecting a presence of a defective bond between the at least one element and the support in the at least one identified zone.