Evolution of photoresist layer structure and surface morphology under fluorocarbon‐based plasma exposure
Evolution of photoresist layer structure and surface morphology under fluorocarbon‐based plasma exposure
复制标题
氟碳等离子体曝光下光刻胶层结构和表面形貌的演变
DOI:
10.1002/ppap.201900026
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发表时间:
2019
影响因子:
3.5
通讯作者:
Oehrlein, Gottlieb S.
中科院分区:
文献类型:
--
作者:
Pranda, Adam;Gutierrez Razo, Sandra A.;Fourkas, John T.;Oehrlein, Gottlieb S.
Ion bombardment of photoresist materials during plasma etching results in the formation of a surface dense amorphous carbon (DAC) layer that contributes to both etch resistance and the development of surface roughness. Real‐time ellipsometric measurements/analysis reveals that a C4F8‐containing plasma interacts with an Ar‐plasma‐formed DAC layer to produce a modified DAC/fluorocarbon (FC) layer by FC deposition/diffusion of fluorine into the surface. The depletion of the DAC layer via modification and ion bombardment causes the etch rate of the bulk layer to increase. As the modified surface layer is formed, a noticeable decrease in surface roughness decrease is observed. These findings provide an understanding of the mechanisms of atomic layer etching processes in photoresist materials.
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