Tang Yu, Wang Zhuangmiao, Gao Mingsheng, Han Jiayin, Yuan Leiming, Zhu Furong
Department of Physics, Research Centre of Excellence for Organic Electronics and Institute of Advanced Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou, China.
Nat Commun. 2025 Aug 4;16(1):7144. doi: 10.1038/s41467-025-62394-6.
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.
能够在近红外（NIR）区域，特别是近红外-I（700 - 900纳米）和近红外-II（1000 - 1700纳米）区域进行检测和成像，由于其卓越的组织穿透和吸收特性，对于医学诊断和生物成像至关重要。有机光电探测器（OPD）因其可调谐的光电特性和灵活的制造工艺，为这些区域的自对准成像提供了一个有前景的解决方案。然而，由于大多数有机半导体材料固有的宽带性质，实现用于近红外-I和近红外-II检测的高性能双模窄带OPD仍然是一个重大挑战。在本研究中，我们引入了一种具有背对背堆叠电荷收集窄化/光电二极管型双本体异质结（BHJ）结构的偏置可切换双模窄带OPD。该双模窄带OPD表现出优异的波长选择性和增强的成像能力，便于在近红外-I和近红外-II区域进行自对准成像。此外，双BHJ结构提供了设计灵活性，允许通过各种BHJ配置实现双模窄带响应。
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