Surfactant-templated porous organosilicate glass low-k films have been deposited by using a tetraethoxysilane (TEOS) and methyltriethoxysilane (MTEOS) mixture with different ratios and Brij® 30 surfactant. The deposited films contain different concentrations of terminal methyl groups that are proportional to the MTEOS concentration. Increasing the methyl group concentration by changing the TEOS/MTEOS ratio decreases the open porosity, k-value, and Young's modulus and increases the mean pore radius, although the template concentration was kept constant. The plasma etch rate well correlates with the number of fluorine atoms penetrated into pores. Plasma damage by fluorine radicals depends on the carbon concentration in the films. It can be reduced by 60% when the carbon concentration in the films exceeds 10 at. % as measured by XPS (the films deposited with the TEOS/MTEOS ratio of 40/60). Damage to the dielectrics associated with exposure to vacuum ultraviolet photons is reduced by more than 70% for the same samples.
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Research Article|
March 16 2020
Effect of terminal methyl group concentration on critical properties and plasma resistance of organosilicate low-k dielectrics
Special Collection:
Special Topic Collection Commemorating the Career of John Coburn
Askar A. Rezvanov
;
Askar A. Rezvanov
a)
1
Moscow Institute of Physics and Technology
, 9 Institutskiy per., Dolgoprudny, Moscow 141700, Russian Federation
2
Molecular Electronics Research Institute
, 1st Zapadny Proezd 12/1, Zelenograd, Moscow 124460, Russian Federation
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Andrey V. Miakonkikh;
Andrey V. Miakonkikh
3
Valiev Institute of Physics and Technology RAS
, Nakhimovsky Prospect 36/1, Moscow 117218, Russian Federation
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Dmitry S. Seregin
;
Dmitry S. Seregin
4
Research and Education Center “Technological Center,” RTU MIREA—Russian Technological University
, Prospect Vernadskogo 78, Moscow 119454, Russian Federation
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Alexey S. Vishnevskiy;
Alexey S. Vishnevskiy
4
Research and Education Center “Technological Center,” RTU MIREA—Russian Technological University
, Prospect Vernadskogo 78, Moscow 119454, Russian Federation
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Konstantin A. Vorotilov;
Konstantin A. Vorotilov
4
Research and Education Center “Technological Center,” RTU MIREA—Russian Technological University
, Prospect Vernadskogo 78, Moscow 119454, Russian Federation
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Konstantin V. Rudenko;
Konstantin V. Rudenko
3
Valiev Institute of Physics and Technology RAS
, Nakhimovsky Prospect 36/1, Moscow 117218, Russian Federation
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Mikhail R. Baklanov
Mikhail R. Baklanov
4
Research and Education Center “Technological Center,” RTU MIREA—Russian Technological University
, Prospect Vernadskogo 78, Moscow 119454, Russian Federation
5
Department of Microelectronics, North China University of Technology
, No. 5 Jinyuanzhuang Road, Shijingshan, Beijing 100144, People’s Republic of China
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a)
Electronic mail: askar.rezvanov@gmail.com
Note: This paper is part of the Special Topic Collection Commemorating the Career of John Coburn.
J. Vac. Sci. Technol. A 38, 033005 (2020)
Article history
Received:
December 23 2019
Accepted:
March 03 2020
Citation
Askar A. Rezvanov, Andrey V. Miakonkikh, Dmitry S. Seregin, Alexey S. Vishnevskiy, Konstantin A. Vorotilov, Konstantin V. Rudenko, Mikhail R. Baklanov; Effect of terminal methyl group concentration on critical properties and plasma resistance of organosilicate low-k dielectrics. J. Vac. Sci. Technol. A 1 May 2020; 38 (3): 033005. https://doi.org/10.1116/1.5143417
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