Studying thickness loss in extreme ultraviolet resists due to electron beam exposure using experiment and modeling

Amrit Kasuik Narasimhan; Steven Grzeskowiak; Bharath Srivats; Henry C. Herbol; Liam Wisehart; Jonathon L. Schad; Chris Kelly; William Earley; Leonidas E. Ocola; Mark Neisser; Gregory H. Denbeaux; Robert L. Brainard

doi:10.1117/1.JMM.14.4.043502

13 October 2015 Studying thickness loss in extreme ultraviolet resists due to electron beam exposure using experiment and modeling

Amrit Kasuik Narasimhan, Steven Grzeskowiak, Bharath Srivats, Henry C. Herbol, Liam Wisehart, Jonathon L. Schad, Chris Kelly, William Earley, Leonidas E. Ocola, Mark Neisser, Gregory H. Denbeaux, Robert L. Brainard

Author Affiliations +

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 14, Issue 4, 043502 (October 2015). https://doi.org/10.1117/1.JMM.14.4.043502

Abstract

Extreme ultraviolet (EUV) photons expose photoresists by complex interactions starting with photoionization that create primary electrons (∼80 eV), followed by ionization steps that create secondary electrons (10 to 60 eV). Ultimately, these lower energy electrons interact with specific molecules in the resist that cause the chemical reactions which are responsible for changes in solubility. The mechanisms by which these electrons interact with resist components are key to optimizing the performance of EUV resists. A resist exposure chamber was built to probe the behavior of electrons within photoresists. Resists were exposed under electron beam and then developed; ellipsometry was used to identify the dependence of electron penetration depth and number of reactions on dose and energy. Additionally, our group has updated a robust software that uses a first principles-based Monte Carlo model called low-energy electron scattering in solids (LESiS) to track secondary electron production, penetration depth, and reaction mechanisms within materials-defined environments. LESiS was used to model the thickness loss experiments to validate its performance with respect to simulated electron penetration depths to inform future modeling work.

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Amrit Kasuik Narasimhan, Steven Grzeskowiak, Bharath Srivats, Henry C. Herbol, Liam Wisehart, Jonathon L. Schad, Chris Kelly, William Earley, Leonidas E. Ocola, Mark Neisser, Gregory H. Denbeaux, and Robert L. Brainard "Studying thickness loss in extreme ultraviolet resists due to electron beam exposure using experiment and modeling," Journal of Micro/Nanolithography, MEMS, and MOEMS 14(4), 043502 (13 October 2015). https://doi.org/10.1117/1.JMM.14.4.043502

Published: 13 October 2015

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