Enhanced Near-Infrared Organic Photodetectors Leveraging Core–Shell Nanotripods
Near-infrared (NIR) photodetectors are essential for diverse applications, including medical diagnostics, optical communication, and bioimaging. Traditional photodetectors, typically made from silicon and III-V semiconductors, struggle with large-area devices on precured or flexible substrates due to complex manufacturing and high costs. Organic photodetectors (OPDs), however, offer cost-effectiveness, flexibility, and a customizable spectral response. In this study, we report our effort to enhance NIR absorption in OPDs by incorporating core-shell structured PdCu@Au@SiO<sub>2</sub> nanotripods (NTs) with a <i>D</i><sub>3h</sub> configuration, designed for localized surface plasmon resonance (LSPR) beyond 1000 nm. Integrating these NTs into the OPD active layer significantly boosts NIR absorption, achieving a responsivity of 0.46 A/W and a dynamic range of 145 dB at 1050 nm. NT-based OPDs show superior sensitivity over the control OPD and a silicon photodetector at wavelengths of over 1000 nm. This improvement is due to the synergistic effects of LSPR and omnidirectional scattering from the PdCu@Au@SiO<sub>2</sub> NTs, enhancing carrier generation and extraction. The improved performance highlights their potential for advanced applications such as long-range photoplethysmography and visual line-of-sight communication systems.
Authors
- Baozhong Deng (ORCID: https://orcid.org/0000-0001-9322-7199)
- Tao Xu (ORCID: https://orcid.org/0000-0001-9527-3834)
- Furong Zhu (ORCID: https://orcid.org/0000-0002-6691-1937)
- Bruno Grandidier (ORCID: https://orcid.org/0000-0001-6131-7309)
- Jianhua Zhang (ORCID: https://orcid.org/0000-0001-8061-1861)
- Clémence Chinaud-Chaix
- Renaud Bachelot (ORCID: https://orcid.org/0000-0003-1847-5787)
- Mona Tréguer‐Delapierre (ORCID: https://orcid.org/0000-0002-3096-6645)
- Kaiwen Zheng (ORCID: https://orcid.org/0000-0001-5262-506X)
- Nan Chen (ORCID: https://orcid.org/0000-0002-2113-1005)
Institutions
- Shanghai University (CN)
- Centre National de la Recherche Scientifique (FR)
- Université de Technologie de Troyes (FR)
- Hong Kong Baptist University (HK)
- Université de Bordeaux (FR)
- Nanyang Technological University (SG)
- Université de Lille (FR)
- Institut de Chimie de la Matière Condensée de Bordeaux (FR)
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (FR)
- Centre of Excellence for Advanced Materials (CN)
- Institut Polytechnique de Bordeaux (FR)
- Université Polytechnique Hauts-de-France (FR)
- École Centrale de Lille (FR)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-06-02
- DOI
- https://doi.org/10.1021/acsami.5c02476
- Citations
- 7
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 5.11
Funders
- National Natural Science Foundation of China
- Research Grants Council, University Grants Committee
- Shanghai University
- Innovation and Technology Fund