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Effect of light irradiation on indentation‐induced dislocation behavior in GaN oriented for basal slip.

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Title: Effect of light irradiation on indentation‐induced dislocation behavior in GaN oriented for basal slip.
Authors: Kinoshita, Ryosuke1 (AUTHOR), Li, Yan1 (AUTHOR) li.yan.es@osaka-u.ac.jp, Oguri, Hiroto1 (AUTHOR), Higuchi, Kimitaka2 (AUTHOR), Arai, Shigeo2 (AUTHOR), Tochigi, Eita3 (AUTHOR), Nakamura, Atsutomo1 (AUTHOR) a.nakamura.es@osaka-u.ac.jp
Source: Journal of the American Ceramic Society. Sep2025, Vol. 108 Issue 9, p1-8. 8p.
Subjects: Strains & stresses (Mechanics), Creep testing, Dislocation nucleation, Nanoindentation tests, Compound semiconductors
Abstract: The impact of external light on dislocation‐based plasticity in inorganic compound semiconductors has been increasingly recognized. Here, we investigated the effect of light on the dislocation behavior in wurtzite GaN oriented for basal slip using photoindentation. Two types of nanoindentation tests were performed in darkness and in 380 nm light on GaN single‐crystal substrates oriented to maximize the Schmid factor for the basal slip. Distinct pop‐in events were observed in the loading segment at loads of 150‒340 μN${{\mu}}{\rm N}$. Analysis of the first pop‐in events revealed that they correspond to homogeneous dislocation nucleation and are largely unaffected by light irradiation. Indentation creep tests at 2 mN showed that both creep depth and creep strain rate decreased in 380 nm light. Cross‐sectional ultra‐high voltage electron microscopy images taken beneath the indentation imprints displayed an asymmetric dislocation distribution with the majority aligned along the [112¯0]$[ {{\mathrm{11\bar{2}0}}} ]$ direction. A significant reduction in the density of indentation‐induced dislocations in 380 nm light was observed, indicating that light irradiation effectively suppresses dislocation glide motion and multiplication in GaN for basal slip. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Effect of light irradiation on indentation‐induced dislocation behavior in GaN oriented for basal slip.
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  Data: <searchLink fieldCode="AR" term="%22Kinoshita%2C+Ryosuke%22">Kinoshita, Ryosuke</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yan%22">Li, Yan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> li.yan.es@osaka-u.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Oguri%2C+Hiroto%22">Oguri, Hiroto</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Higuchi%2C+Kimitaka%22">Higuchi, Kimitaka</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Arai%2C+Shigeo%22">Arai, Shigeo</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tochigi%2C+Eita%22">Tochigi, Eita</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nakamura%2C+Atsutomo%22">Nakamura, Atsutomo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> a.nakamura.es@osaka-u.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Sep2025, Vol. 108 Issue 9, p1-8. 8p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Creep+testing%22">Creep testing</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+nucleation%22">Dislocation nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoindentation+tests%22">Nanoindentation tests</searchLink><br /><searchLink fieldCode="DE" term="%22Compound+semiconductors%22">Compound semiconductors</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The impact of external light on dislocation‐based plasticity in inorganic compound semiconductors has been increasingly recognized. Here, we investigated the effect of light on the dislocation behavior in wurtzite GaN oriented for basal slip using photoindentation. Two types of nanoindentation tests were performed in darkness and in 380 nm light on GaN single‐crystal substrates oriented to maximize the Schmid factor for the basal slip. Distinct pop‐in events were observed in the loading segment at loads of 150‒340 μN${{\mu}}{\rm N}$. Analysis of the first pop‐in events revealed that they correspond to homogeneous dislocation nucleation and are largely unaffected by light irradiation. Indentation creep tests at 2 mN showed that both creep depth and creep strain rate decreased in 380 nm light. Cross‐sectional ultra‐high voltage electron microscopy images taken beneath the indentation imprints displayed an asymmetric dislocation distribution with the majority aligned along the [112¯0]$[ {{\mathrm{11\bar{2}0}}} ]$ direction. A significant reduction in the density of indentation‐induced dislocations in 380 nm light was observed, indicating that light irradiation effectively suppresses dislocation glide motion and multiplication in GaN for basal slip. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/jace.20663
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      – Code: eng
        Text: English
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        PageCount: 8
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    Subjects:
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Creep testing
        Type: general
      – SubjectFull: Dislocation nucleation
        Type: general
      – SubjectFull: Nanoindentation tests
        Type: general
      – SubjectFull: Compound semiconductors
        Type: general
    Titles:
      – TitleFull: Effect of light irradiation on indentation‐induced dislocation behavior in GaN oriented for basal slip.
        Type: main
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          Name:
            NameFull: Kinoshita, Ryosuke
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            NameFull: Li, Yan
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            NameFull: Oguri, Hiroto
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            NameFull: Higuchi, Kimitaka
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            NameFull: Arai, Shigeo
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            NameFull: Tochigi, Eita
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            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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              Value: 108
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            – TitleFull: Journal of the American Ceramic Society
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