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Hydrogen effusion from tritiated amorphous silicon

Kherani, NP and Liu, B and Virk, K and Kosteski, T and Gaspari, F and Shmayda, WT and Zukotynski, S and Chen, KP (2008) Hydrogen effusion from tritiated amorphous silicon. Journal of Applied Physics, 103 (2). ISSN 0021-8979

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Results for the effusion and outgassing of tritium from tritiated hydrogenated amorphous silicon (a-Si:H:T) films are presented. The samples were grown by dc-saddle field glow discharge at various substrate temperatures between 150 and 300 °C. The tracer property of radioactive tritium is used to detect tritium release. Tritium effusion measurements are performed in a nonvacuum ion chamber and are found to yield similar results as reported for standard high vacuum technique. The results suggest for decreasing substrate temperature the growth of material with an increasing concentration of voids. These data are corroborated by analysis of infrared absorption data in terms of microstructure parameters. For material of low substrate temperature (and high void concentration) tritium outgassing in air at room temperature was studied, and it was found that after 600 h about 0.2% of the total hydrogen (hydrogen+tritium) content is released. Two rate limiting processes are identified. The first process, fast tritium outgassing with a time constant of 15 h, seems to be related to surface desorption of tritiated water (HTO) with a free energy of desorption of 1.04 eV. The second process, slow tritium outgassing with a time constant of 200-300 h, appears to be limited by oxygen diffusivity in a growing oxide layer. This material of lowest H stability would lose half of the hydrogen after 60 years. © 2008 American Institute of Physics.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Kherani, NP
Liu, B
Virk, K
Kosteski, T
Gaspari, F
Shmayda, WT
Zukotynski, S
Chen, KPpec9@pitt.eduPEC90000-0002-4830-0817
Date: 7 February 2008
Date Type: Publication
Journal or Publication Title: Journal of Applied Physics
Volume: 103
Number: 2
DOI or Unique Handle: 10.1063/1.2831495
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Refereed: Yes
ISSN: 0021-8979
Date Deposited: 30 Jun 2014 18:00
Last Modified: 15 Jan 2021 15:55


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