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High-Performance Terahertz Detection via Quasi-2D Perovskite/Weyl Semimetal Heterojunction.

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Title: High-Performance Terahertz Detection via Quasi-2D Perovskite/Weyl Semimetal Heterojunction.
Authors: Feng, Chao1 (AUTHOR), Liu, Baoxing1 (AUTHOR), Ning, Haoyi1 (AUTHOR), Hua, Leying1 (AUTHOR), Zheng, Zhixiang1 (AUTHOR), Li, Shuhong1 (AUTHOR), Wang, Wenjun1 (AUTHOR), Liu, Yunlong1 (AUTHOR)
Source: Materials (1996-1944). May2026, Vol. 19 Issue 9, p1847. 11p.
Subjects: Perovskite, Heterojunctions, Band gaps, Photodetectors, Terahertz spectroscopy, Charge carriers
Abstract: Highlights: A novel quasi-2D perovskite/Weyl semimetal (Co3Sn2S2) heterojunction is fabricated for THz detection. The detector achieves a record-high responsivity of 374.15 A/W and an NEP of 0.29 pW·Hz−1/2 at 0.1 THz. Band engineering and 455 nm laser treatment synergistically enhance THz absorption and carrier extraction. Terahertz radiation exhibits significant potential for communications, imaging, and spectroscopy. However, the development of efficient and low-cost THz detectors remains challenging due to limitations such as insufficient sensitivity, slow response speed, and poor room temperature stability. This work presents an innovative quasi-2D perovskite/Weyl semimetal (Co3Sn2S2) heterojunction THz detector that combines complementary material properties via band engineering. The device achieves a remarkable responsivity of 374.15 A/W, a specific detectivity of 6.27 × 1011 cm·Hz1/2·W−1, and a noise-equivalent power of 0.29 pW·Hz−1/2 at 0.1 THz. This performance stems from the strong THz absorption of the perovskite layer combined with the high carrier mobility and topological surface states of the Co3Sn2S2, which collectively enable ultrafast carrier extraction and suppressed interfacial recombination. This heterojunction design offers a novel strategy for high-performance terahertz detection and facilitates its integration into next-generation portable, integrated devices. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) 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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  Label: Title
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  Data: High-Performance Terahertz Detection via Quasi-2D Perovskite/Weyl Semimetal Heterojunction.
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  Data: <searchLink fieldCode="AR" term="%22Feng%2C+Chao%22">Feng, Chao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Baoxing%22">Liu, Baoxing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ning%2C+Haoyi%22">Ning, Haoyi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hua%2C+Leying%22">Hua, Leying</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zheng%2C+Zhixiang%22">Zheng, Zhixiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Shuhong%22">Li, Shuhong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Wenjun%22">Wang, Wenjun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yunlong%22">Liu, Yunlong</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. May2026, Vol. 19 Issue 9, p1847. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Heterojunctions%22">Heterojunctions</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Photodetectors%22">Photodetectors</searchLink><br /><searchLink fieldCode="DE" term="%22Terahertz+spectroscopy%22">Terahertz spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+carriers%22">Charge carriers</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Highlights: A novel quasi-2D perovskite/Weyl semimetal (Co3Sn2S2) heterojunction is fabricated for THz detection. The detector achieves a record-high responsivity of 374.15 A/W and an NEP of 0.29 pW·Hz−1/2 at 0.1 THz. Band engineering and 455 nm laser treatment synergistically enhance THz absorption and carrier extraction. Terahertz radiation exhibits significant potential for communications, imaging, and spectroscopy. However, the development of efficient and low-cost THz detectors remains challenging due to limitations such as insufficient sensitivity, slow response speed, and poor room temperature stability. This work presents an innovative quasi-2D perovskite/Weyl semimetal (Co3Sn2S2) heterojunction THz detector that combines complementary material properties via band engineering. The device achieves a remarkable responsivity of 374.15 A/W, a specific detectivity of 6.27 × 1011 cm·Hz1/2·W−1, and a noise-equivalent power of 0.29 pW·Hz−1/2 at 0.1 THz. This performance stems from the strong THz absorption of the perovskite layer combined with the high carrier mobility and topological surface states of the Co3Sn2S2, which collectively enable ultrafast carrier extraction and suppressed interfacial recombination. This heterojunction design offers a novel strategy for high-performance terahertz detection and facilitates its integration into next-generation portable, integrated devices. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) 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/ma19091847
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        Text: English
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        PageCount: 11
        StartPage: 1847
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      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: Heterojunctions
        Type: general
      – SubjectFull: Band gaps
        Type: general
      – SubjectFull: Photodetectors
        Type: general
      – SubjectFull: Terahertz spectroscopy
        Type: general
      – SubjectFull: Charge carriers
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    Titles:
      – TitleFull: High-Performance Terahertz Detection via Quasi-2D Perovskite/Weyl Semimetal Heterojunction.
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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