Ambient controlled two-step thermal treatment for spin-on coating layer planarization
US12087592B2 · kind B2 · utility
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Key dates
| Filing date | Aug 8, 2023 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Aug 8, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/31144
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
To reduce a thickness variation of a spin-on coating (SOC) layer that is applied over a plurality of first and second trenches with different pattern densities as a bottom layer in a photoresist stack, a two-step thermal treatment process is performed on the SOC layer. A first thermal treatment step in the two-step thermal treatment process is conducted at a first temperature below a cross-linking temperature of the SOC layer to cause flow of the SOC layer, and a second thermal treatment step in the two-step thermal treatment process is conducted at a second temperature to cause cross-linking of the SOC layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.