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Effect of hydrogen concentration on structure and photoelectric properties of a-Si:H films modified by femtosecond laser pulses

Effect of hydrogen concentration on structure and photoelectric properties of a-Si:H films modified by femtosecond laser pulses
Effect of hydrogen concentration on structure and photoelectric properties of a-Si:H films modified by femtosecond laser pulses
The crystallization of hydrogenated amorphous silicon films with femtosecond laser pulses is one of the promising ways to produce nanocrystalline silicon for photovoltaics. The structure of laser treated films and their hydrogen content are the most important factors for determining the photoelectric properties of materials. In this work we investigated the effect of femtosecond laser irradiation of a-Si:H films with different fluences on crystalline volume fraction, hydrogen concentration, and photoelectric properties of this material. Our results point out that hydrogen out-diffusion accompanies the crystallization process. The increase of hydrogen concentration in the initial a-Si:H films structure affects the kinetics of the crystallization process, but does not lead to a substantial increase of hydrogen concentration remaining in the film after the treatment. The deficiency of hydrogen in the films’ structure results in degradation of their photoconductivity, thus other strategies of a-Si:H laser crystallization or postprocessing should be found to obtain device-quality films using ultrafast laser processing.
0008-4204
883-887
Khenkin, Mark
83394eeb-b2c5-4797-9297-f5f2dbbc44ce
Emelyanov, Andrey
21f68a58-fc5b-4fca-992f-74b2fe9cf56a
Kazanskii, Andrey
1cfbbe0d-f3d6-4c76-9cd0-c6da5133d1b4
Forsh, Pavel
0f7fd9fd-0335-4a7a-b096-63d09b123de1
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Gecevičius, Mindaugas
271576ee-dd9d-40b3-ab2f-19686b91dc64
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Khenkin, Mark
83394eeb-b2c5-4797-9297-f5f2dbbc44ce
Emelyanov, Andrey
21f68a58-fc5b-4fca-992f-74b2fe9cf56a
Kazanskii, Andrey
1cfbbe0d-f3d6-4c76-9cd0-c6da5133d1b4
Forsh, Pavel
0f7fd9fd-0335-4a7a-b096-63d09b123de1
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Gecevičius, Mindaugas
271576ee-dd9d-40b3-ab2f-19686b91dc64
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c

Khenkin, Mark, Emelyanov, Andrey, Kazanskii, Andrey, Forsh, Pavel, Beresna, Martynas, Gecevičius, Mindaugas and Kazansky, Peter (2014) Effect of hydrogen concentration on structure and photoelectric properties of a-Si:H films modified by femtosecond laser pulses. Canadian Journal of Physics, 92 (7/8), 883-887. (doi:10.1139/cjp-2013-0582).

Record type: Article

Abstract

The crystallization of hydrogenated amorphous silicon films with femtosecond laser pulses is one of the promising ways to produce nanocrystalline silicon for photovoltaics. The structure of laser treated films and their hydrogen content are the most important factors for determining the photoelectric properties of materials. In this work we investigated the effect of femtosecond laser irradiation of a-Si:H films with different fluences on crystalline volume fraction, hydrogen concentration, and photoelectric properties of this material. Our results point out that hydrogen out-diffusion accompanies the crystallization process. The increase of hydrogen concentration in the initial a-Si:H films structure affects the kinetics of the crystallization process, but does not lead to a substantial increase of hydrogen concentration remaining in the film after the treatment. The deficiency of hydrogen in the films’ structure results in degradation of their photoconductivity, thus other strategies of a-Si:H laser crystallization or postprocessing should be found to obtain device-quality films using ultrafast laser processing.

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Published date: July 2014
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 367776
URI: http://eprints.soton.ac.uk/id/eprint/367776
ISSN: 0008-4204
PURE UUID: ba3074d1-c1b8-4246-b99c-8caad80f251c

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Date deposited: 29 Aug 2014 14:54
Last modified: 15 Jul 2019 21:49

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Contributors

Author: Mark Khenkin
Author: Andrey Emelyanov
Author: Andrey Kazanskii
Author: Pavel Forsh
Author: Mindaugas Gecevičius
Author: Peter Kazansky

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