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Photoindentation : A Method to Understand Dislocation Behavior of Inorganic Semiconductors in Light at the Nanoscale

Nakamura, Atsutomo ; Fang, Xufei ; Matsubara, Ayaka ; Oshima, Yu ; Matsunaga, Katsuyuki (2021)
Photoindentation : A Method to Understand Dislocation Behavior of Inorganic Semiconductors in Light at the Nanoscale.
In: Journal of the Ceramic Society of Japan, 68 (11)
doi: 10.2497/jjspm.68.469
Article, Bibliographie

Abstract

The science and technology related with light has revolutionized modern society, and understanding the effects of light on semiconducting materials has become crucial to current science and technology. Although much research has been done on the effects of light on the electronic and optical properties of materials, the effects of light on the mechanical properties of materials are not well understood. It was recently found that extraordinarily large plasticity appears in bulk compression of single-crystal ZnS in complete darkness even at room-temperature. This is believed to be due to the less interactions between dislocations and photo-excited electrons and/or holes. However, methods for evaluating dislocation behavior in such semiconductors with small dimensions under a particular light condition had not been well established. Here we show a new nanoindentation method that incorporates well designed lighting system for exploring dislocation behavior depending on the light conditions in advanced semiconductors. We used single-crystal ZnS as a model material because its bulk deformation behavior has been well investigated. It is confirmed that the decrease of dislocation mobility with light observed in conventional bulk deformation tests can be understood even by the nanoindentation tests at room-temperature. It is remarkable that we experimentally demonstrate that dislocation mobility appears to be more sensitive to light exposure than dislocation nucleation.

Item Type: Article
Erschienen: 2021
Creators: Nakamura, Atsutomo ; Fang, Xufei ; Matsubara, Ayaka ; Oshima, Yu ; Matsunaga, Katsuyuki
Type of entry: Bibliographie
Title: Photoindentation : A Method to Understand Dislocation Behavior of Inorganic Semiconductors in Light at the Nanoscale
Language: Japanese
Date: 22 November 2021
Publisher: The Ceramic Society of Japan
Journal or Publication Title: Journal of the Ceramic Society of Japan
Volume of the journal: 68
Issue Number: 11
DOI: 10.2497/jjspm.68.469
Abstract:

The science and technology related with light has revolutionized modern society, and understanding the effects of light on semiconducting materials has become crucial to current science and technology. Although much research has been done on the effects of light on the electronic and optical properties of materials, the effects of light on the mechanical properties of materials are not well understood. It was recently found that extraordinarily large plasticity appears in bulk compression of single-crystal ZnS in complete darkness even at room-temperature. This is believed to be due to the less interactions between dislocations and photo-excited electrons and/or holes. However, methods for evaluating dislocation behavior in such semiconductors with small dimensions under a particular light condition had not been well established. Here we show a new nanoindentation method that incorporates well designed lighting system for exploring dislocation behavior depending on the light conditions in advanced semiconductors. We used single-crystal ZnS as a model material because its bulk deformation behavior has been well investigated. It is confirmed that the decrease of dislocation mobility with light observed in conventional bulk deformation tests can be understood even by the nanoindentation tests at room-temperature. It is remarkable that we experimentally demonstrate that dislocation mobility appears to be more sensitive to light exposure than dislocation nucleation.

Uncontrolled Keywords: dislocations, inorganic semiconductors, room-temperature plasticity, nanoindentation, photoplastic effect
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 23 Nov 2021 06:11
Last Modified: 23 Nov 2021 06:11
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