Patent ID: 11915931
Assignee: TOKYO ELECTRON LIMITED
Field: Optics (Instruments)
Classification: CPC H  G | IPC H

Claim 11:
12. A method for forming an etch mask over a substrate, the method comprising:
forming an electron booster layer adhering to a major surface of the substrate;
exposing the major surface of the electron booster layer to a hydrogen-containing gas to convert the major surface be hydrophobic;
forming a photoresist layer adhering to the hydrophobic major surface of the electron booster layer;
exposing a first portion of the photoresist layer with a pattern of extreme ultraviolet (EUV) radiation;
exposing a second portion of the photoresist layer with electron flux directed from the electron booster layer, wherein a portion of the EUV radiation is absorbed below the photoresist layer to generate the electron flux;
developing the exposed photoresist layer to form a patterned photoresist layer; and
patterning the electron booster layer with the patterned photoresist layer to form a patterned electron booster layer, the etch mask being the combined patterned electron booster layer and the patterned photoresist layer remaining after patterning the electron booster layer.