Invention Grant
- Patent Title: Method of manufacturing semiconductor devices, corresponding apparatus and semiconductor device
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Application No.: US18121145Application Date: 2023-03-14
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Publication No.: US12125803B2Publication Date: 2024-10-22
- Inventor: Paolo Crema
- Applicant: STMicroelectronics S.r.l.
- Applicant Address: IT Agrate Brianza
- Assignee: STMicroelectronics S.r.l.
- Current Assignee: STMicroelectronics S.r.l.
- Current Assignee Address: IT Agrate Brianza
- Agency: Crowe & Dunlevy LLC
- Priority: IT 2019000022641 2019.12.02
- The original application number of the division: US17108187 2020.12.01
- Main IPC: H01L23/495
- IPC: H01L23/495 ; B23K26/0622 ; B23K26/354 ; H01L21/48 ; H01L21/56 ; H01L23/00 ; H01L23/31 ; B23K103/08

Abstract:
A leadframe has a die pad area and an outer layer of a first metal having a first oxidation potential. The leadframe is placed in contact with a solution containing a second metal having a second oxidation potential, the second oxidation potential being more negative than the first oxidation potential. Radiation energy is then applied to the die pad area of the leadframe contacted with the solution to cause a local increase in temperature of the leadframe. As a result of the temperature increase, a layer of said second metal is selectively provided at the die pad area of the leadframe by a galvanic displacement reaction. An oxidation of the outer layer of the leadframe is then performed to provide an enhancing layer which counters device package delamination.
Public/Granted literature
- US20230215819A1 METHOD OF MANUFACTURING SEMICONDUCTOR DEVICES, CORRESPONDING APPARATUS AND SEMICONDUCTOR DEVICE Public/Granted day:2023-07-06
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