Invention Grant
- Patent Title: Contact etching and metallization for improved LED device performance and reliability
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Application No.: US16736424Application Date: 2020-01-07
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Publication No.: US10916683B2Publication Date: 2021-02-09
- Inventor: David Chong , Yeow-Meng Teo
- Applicant: Lumileds LLC
- Applicant Address: US CA San Jose
- Assignee: Lumileds LLC
- Current Assignee: Lumileds LLC
- Current Assignee Address: US CA San Jose
- Agency: Volpe Koenig
- Priority: EP16159678 20160310
- Main IPC: H01L33/38
- IPC: H01L33/38 ; H01L33/40 ; H01L33/44 ; H01L33/46 ; H01L33/06

Abstract:
A light emitting device includes a vertical via through the P-type semiconductor layer and the active layer. Using a vertical via reduces quantum well damage, allows shortening of P-N spacing, and allows increased reflective area. A dielectric structure is formed in the via to provide a sloped wall that extends to an upper surface of the device. Another dielectric layer covers the upper surface and the sloped wall, and provides select contacts to the semiconductor layers. A metal layer is subsequently applied. Because the dielectric layers provide a continuous slope from the surface of the device, the metal layer does not include a vertical drop. Because the active layer does not extend into the via, the contact to the N-type semiconductor layer may be situated closer to the wall of the via, increasing the area available for a reflective layer.
Information query
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