Dual-mode narrowband organic photodetectors for self-aligned imaging in NIR-I and NIR-II

Yu Tang, Zhuangmiao Wang, Mingsheng Gao, Jiayin Han, Leiming Yuan and Furong Zhu ()
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Yu Tang: Hong Kong Baptist University
Zhuangmiao Wang: Hong Kong Baptist University
Mingsheng Gao: Hong Kong Baptist University
Jiayin Han: Hong Kong Baptist University
Leiming Yuan: Hong Kong Baptist University
Furong Zhu: Hong Kong Baptist University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract The ability to detect and image in the near-infrared (NIR) regions, specifically NIR-I (700–900 nm) and NIR-II (1000–1700 nm), is crucial for medical diagnostics and bioimaging due to their exceptional tissue penetration and absorption characteristics. Organic photodetectors (OPDs) present a promising solution for self-aligned imaging in these regions, due to their tunable optoelectronic properties and flexible fabrication processes. However, achieving high-performance dual-mode narrowband OPDs for NIR-I and NIR-II detection remains a significant challenge due to the inherently broadband nature of most organic semiconductor materials. In this study, we introduce a bias-switchable dual-mode narrowband OPD with a back-to-back stacked charge collection narrowing/photodiode-type double bulk heterojunction (BHJ) architecture. The dual-mode narrowband OPD exhibits excellent wavelength selectivity and enhanced imaging capabilities, facilitating self-aligned imaging in both NIR-I and NIR-II regions. Additionally, the double BHJ architecture provides design flexibility, allowing for the realization of dual-mode narrowband responses through various BHJ configurations.

Date: 2025
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DOI: 10.1038/s41467-025-62394-6

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