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A Broad-Band Self-Powered Photodetector Based on a MoTe 2 /Bi 2 Te 3 Heterojunction for Optical Imaging and Bias-Controlled Signal Modulation.

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Title: A Broad-Band Self-Powered Photodetector Based on a MoTe 2 /Bi 2 Te 3 Heterojunction for Optical Imaging and Bias-Controlled Signal Modulation.
Authors: Du, Shaoxiong1 (AUTHOR) dushaoxiong0402@outlook.com, Li, Kunle1,2 (AUTHOR), Li, Weijie1 (AUTHOR), Feng, Jiahui1,2 (AUTHOR), Sheng, Yunwei1 (AUTHOR), Tao, Lili1 (AUTHOR), Zheng, Zhaoqiang1 (AUTHOR), Song, Wei2 (AUTHOR), Zhao, Yu1 (AUTHOR)
Source: Materials (1996-1944). Mar2026, Vol. 19 Issue 6, p1270. 13p.
Subjects: Photodetectors, Optical modulation, Photovoltaic effect, Photosensitivity, Photoelectricity, Optical images
Abstract: Self-powered photodetectors are highly demanded in applications but often suffer from limited spectral absorption, slow response speed, and high dark currents. Two-dimensional van der Waals heterostructures have emerged as promising candidates owing to their designable structures and excellent performance. Herein, we construct a MoTe2/Bi2Te3 heterostructure and investigate its photoelectric properties. At zero bias, it exhibits a broad photovoltaic response ranging from 405 to 1550 nm. Benefiting from the interfacial built-in electric field, it achieves a responsivity of 1.38 A/W and a detectivity of 1.90 × 1012 Jones at 532 nm and retains 174.56 mA/W and 2.4 × 1011 Jones at 1060 nm, together with a low dark current of 1.6 × 10−12 A. Upon a reverse bias of −1 V and 532 nm laser illumination at an intensity of 19.0 W/m2, the responsivity is further boosted to 36.22 A/W, accompanied by rise and decay times of 32 ms and 33 ms, respectively. Taking advantage of the distinct optical switching ratios at zero/non-zero biases, application in optical imaging and bias-controlled signal modulation is realized, highlighting the heterojunction's potential as a broadband self-powered photodetector. [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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  Data: A Broad-Band Self-Powered Photodetector Based on a MoTe 2 /Bi 2 Te 3 Heterojunction for Optical Imaging and Bias-Controlled Signal Modulation.
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  Data: Self-powered photodetectors are highly demanded in applications but often suffer from limited spectral absorption, slow response speed, and high dark currents. Two-dimensional van der Waals heterostructures have emerged as promising candidates owing to their designable structures and excellent performance. Herein, we construct a MoTe2/Bi2Te3 heterostructure and investigate its photoelectric properties. At zero bias, it exhibits a broad photovoltaic response ranging from 405 to 1550 nm. Benefiting from the interfacial built-in electric field, it achieves a responsivity of 1.38 A/W and a detectivity of 1.90 × 1012 Jones at 532 nm and retains 174.56 mA/W and 2.4 × 1011 Jones at 1060 nm, together with a low dark current of 1.6 × 10−12 A. Upon a reverse bias of −1 V and 532 nm laser illumination at an intensity of 19.0 W/m2, the responsivity is further boosted to 36.22 A/W, accompanied by rise and decay times of 32 ms and 33 ms, respectively. Taking advantage of the distinct optical switching ratios at zero/non-zero biases, application in optical imaging and bias-controlled signal modulation is realized, highlighting the heterojunction's potential as a broadband self-powered photodetector. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  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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      – SubjectFull: Optical modulation
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      – SubjectFull: Photovoltaic effect
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      – SubjectFull: Photosensitivity
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      – SubjectFull: Optical images
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      – TitleFull: A Broad-Band Self-Powered Photodetector Based on a MoTe 2 /Bi 2 Te 3 Heterojunction for Optical Imaging and Bias-Controlled Signal Modulation.
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              Text: Mar2026
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