Fast, Downstream Removal of Photoresist Using Reactive Oxygen Species From The Effluent of An Atmospheric Pressure Plasma Jet

Andrew Thomas West, Marc van der Schans, Cigang Xu, Mike Cooke, Erik Wagenaars

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In the semiconductor industry the plasma removal of photoresist (PR) between processing steps (so-called plasma ashing) is a critical issue in enabling the creation of advanced wafer architectures associated with the next generation of devices. We investigated the feasibility of a novel Atmospheric-Pressure Plasma Jet (APPJ) to remove PR. Our device operates at atmospheric pressure, eliminating the need for low-pressure operation used in conventional plasma ashing. Also, our method uses the downstream effluent of the source, avoiding issues relating to ion bombardment, a known hinderance to atomic precision manufacturing. Two-photon absorption laser induced fluorescence (TALIF) measurements of the system has shown that the PR removal rate is directly correlated with the atomic oxygen flux to the surface. The maximum removal rates achieved were 10 μm/min, a factor of 100 improvement over typical low-pressure methods, while the quality of the etch, as assessed by Attenuated Total Reflection Fourier Transform Infrared Spectroscopy, was found to be equal to low-pressure standards.
Original languageEnglish
Article number02LT01
JournalPlasma sources science & technology
Issue number2
Publication statusPublished - 4 Mar 2016

Bibliographical note

This content is made available by the publisher under a Creative Commons Attribution Licence. This means that a user may copy, distribute and display the resource providing that they give credit. Users must adhere to the terms of the licence. Date of Acceptance: 04/02/2016

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