Volume 21, Issue 12 2410418
Research Article

Efficient SWIR Organic Photodetectors with Spectral Detection Extending to 1.4 µm Using a Benzobisthiadiazole-Based Acceptor

Jiawen Cong

Jiawen Cong

Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060 China

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Zhi-Hao Huang

Zhi-Hao Huang

Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301 Taiwan

Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 33302 Taiwan

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Shun-Wei Liu

Shun-Wei Liu

Organic Electrons Research Center, Ming Chi University of Technology, New Taipei City, 24301 Taiwan

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Zhenghui Luo

Corresponding Author

Zhenghui Luo

Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060 China

E-mail: [email protected]; [email protected]; [email protected]

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Fu-Zong Liu

Fu-Zong Liu

Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301 Taiwan

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Zhanxiang Chen

Zhanxiang Chen

Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060 China

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Kun-Mu Lee

Kun-Mu Lee

Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 33302 Taiwan

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Yu-Ching Huang

Corresponding Author

Yu-Ching Huang

Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301 Taiwan

Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 33302 Taiwan

Organic Electrons Research Center, Ming Chi University of Technology, New Taipei City, 24301 Taiwan

E-mail: [email protected]; [email protected]; [email protected]

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Chuluo Yang

Corresponding Author

Chuluo Yang

Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 11 February 2025
Citations: 4

Abstract

Organic photodetectors (OPDs) offer significant advantages in biomedical applications, including medical imaging, heart rate monitoring, and tumor therapy. Despite advancements in OPD technology, the efficiency of these devices in the short-wave infrared (SWIR) region remains considerably lower than that of inorganic semiconductors. To tackle this challenge, this study developed an ultra-narrow bandgap acceptor of CS-1, featuring an A-D-A1-D-A structure where benzobisthiadiazole (BBT) serves as the electron-deficient unit A1, which exhibits a wide absorption range from 300 to 1550 nm. This molecular design not only enhances the absorption properties of the material but also improves the overall performance of the OPD device. It is worth noting that the optimal PTB7-Th:CS-1 device realizes a specific detectivity (Dn*) of 2.96 × 1010 Jones at 1.30 µm, making it one of the most efficient devices at this wavelength to date. Additionally, it demonstrates the high linear dynamic range (LDR) of 91.9 dB even at 1300 nm. These results indicate that the PTB7-Th:CS-1 device significantly enhances detection efficiency in the SWIR region, surpassing most commercially available silicon-based photodetectors. This highlights the significant potential of the BBT unit for achieving high-performance SWIR OPDs.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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