| 摘要 |
Disclosed are embodiments of a bi-layer bottom anti-reflective coating (BARC) with graded optical properties (i.e., a graded refractive index) and a method of forming the BARC. The BARC is formed by sequentially coating two BARC layers onto a substrate. Each BARC layer comprises a polymer and an optical component, each has slightly different optical properties, and each is processed such that either the polymers partially intermix or the optical component partially diffuses between the layers in order to create a graded chromophore concentration across the resulting BARC. Thus, a gradual transition of optical properties is created from the substrate/BARC interface to the BARC/photo-resist interface.
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