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Engineering Properties of GeSi Alloy Quantum Dots by High-Temperature Annealing.

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Title: Engineering Properties of GeSi Alloy Quantum Dots by High-Temperature Annealing.
Authors: Luo, Wei1 (AUTHOR), Yin, Yang1 (AUTHOR) 22110190074@m.fudan.edu.cn, Huang, Qiang1 (AUTHOR), Yang, Jingpu1 (AUTHOR), Zhan, Yan1 (AUTHOR), Liu, Zitong1 (AUTHOR), Jiang, Zuimin1 (AUTHOR), Zheng, Changlin1 (AUTHOR), Zhong, Zhenyang1 (AUTHOR)
Source: Nanomaterials (2079-4991). Jun2026, Vol. 16 Issue 12, p736. 11p.
Subjects: Semiconductor quantum dots, Rapid thermal processing, Photoluminescence, Transmission electron microscopy, Thermal expansion, Optoelectronics, Strains & stresses (Mechanics)
Abstract: GeSi alloy quantum dots (QDs) are a promising candidate for a light source implemented in Si-based monolithic optoelectronic integrated circuits (MOEICs) thanks to their telecom-wavelength emission and the compatibility with the Si integration technology. Herein, the engineering properties of GeSi alloy QDs are demonstrated via rapid thermal annealing (RTA). The PL spectra of GeSi alloy QDs exhibits remarkably enhanced intensity and an initial red shift followed by a blue shift with increasing annealing temperature. Particularly, it can be characterized as a single narrow peak at ~1.55 µm of the intensity enhanced by ~20 times after the RTA at 1100 °C. These features are attributed to the progressively enhanced intermixing and the abnormal transition from compressive strain to tensile strain in QDs with increasing annealing temperature, which are demonstrated by Raman spectra and transmission electron microscopy (TEM) images. Moreover, a large polycrystalline-domain appears around QD at a sufficiently high annealing temperature. It facilitates the tensile strain in QDs, which arises during the RTA due to the thermal expansion coefficient mismatch between Ge and Si. These results demonstrate that high-temperature annealing can efficiently modulate the properties of GeSi alloy QDs, particularly for emission at 1.55 µm, which may have great potential for an efficient Si-based light source. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI 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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  Data: Engineering Properties of GeSi Alloy Quantum Dots by High-Temperature Annealing.
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  Data: <searchLink fieldCode="AR" term="%22Luo%2C+Wei%22">Luo, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yin%2C+Yang%22">Yin, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 22110190074@m.fudan.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Huang%2C+Qiang%22">Huang, Qiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Jingpu%22">Yang, Jingpu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhan%2C+Yan%22">Zhan, Yan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Zitong%22">Liu, Zitong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Zuimin%22">Jiang, Zuimin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zheng%2C+Changlin%22">Zheng, Changlin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhong%2C+Zhenyang%22">Zhong, Zhenyang</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Jun2026, Vol. 16 Issue 12, p736. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Semiconductor+quantum+dots%22">Semiconductor quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Rapid+thermal+processing%22">Rapid thermal processing</searchLink><br /><searchLink fieldCode="DE" term="%22Photoluminescence%22">Photoluminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Optoelectronics%22">Optoelectronics</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
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  Label: Abstract
  Group: Ab
  Data: GeSi alloy quantum dots (QDs) are a promising candidate for a light source implemented in Si-based monolithic optoelectronic integrated circuits (MOEICs) thanks to their telecom-wavelength emission and the compatibility with the Si integration technology. Herein, the engineering properties of GeSi alloy QDs are demonstrated via rapid thermal annealing (RTA). The PL spectra of GeSi alloy QDs exhibits remarkably enhanced intensity and an initial red shift followed by a blue shift with increasing annealing temperature. Particularly, it can be characterized as a single narrow peak at ~1.55 µm of the intensity enhanced by ~20 times after the RTA at 1100 °C. These features are attributed to the progressively enhanced intermixing and the abnormal transition from compressive strain to tensile strain in QDs with increasing annealing temperature, which are demonstrated by Raman spectra and transmission electron microscopy (TEM) images. Moreover, a large polycrystalline-domain appears around QD at a sufficiently high annealing temperature. It facilitates the tensile strain in QDs, which arises during the RTA due to the thermal expansion coefficient mismatch between Ge and Si. These results demonstrate that high-temperature annealing can efficiently modulate the properties of GeSi alloy QDs, particularly for emission at 1.55 µm, which may have great potential for an efficient Si-based light source. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI 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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        Value: 10.3390/nano16120736
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        Text: English
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        PageCount: 11
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      – SubjectFull: Photoluminescence
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      – SubjectFull: Transmission electron microscopy
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      – SubjectFull: Thermal expansion
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      – SubjectFull: Optoelectronics
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      – SubjectFull: Strains & stresses (Mechanics)
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      – TitleFull: Engineering Properties of GeSi Alloy Quantum Dots by High-Temperature Annealing.
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              Text: Jun2026
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