Plasmonic Photovoltaic Effect of an Original 2D Electron Gas System and Application in Mid‐Infrared Imaging
Abstract Owing to their consistently emerging applications in modern photonics, highly sensitive and rapid mid‐infrared (MIR) photodetectors, operating at high temperatures, are of great significance. Herein, a novel PbTe/Ge heterostructure is introduced. Notably, the discovery of a 2D electron gas (2DEG) system on the surface of the PbTe layer is experimentally identified for the first time. A high‐performance PbTe/Ge heterostructure MIR photodetector utilizing a plasmonic photovoltaic effect is developed by employing asymmetric electrodes. The photodetecting device demonstrates an exceptionally high detectivity of 1.1 × 10 11 Jones along with a short response time of 15 ns at room temperature. Additionally, the proposed plasmonic photovoltaic mechanism of the device is investigated and mainly ascribed to the propagating plasmons, generated by the coupling of the 2DEG with incident MIR photons. Moreover, a linear detector array (LDA) of PbTe/Ge is demonstrated for a thermal imaging application, which exhibits promising high‐quality real‐time imaging via the 2D photodetector arrays on Ge‐based integrated circuits. This work opens up a new way for the development of next‐generation, advanced MIR photonic devices and integrated photonic systems.
Authors
- Wei Fang (ORCID: https://orcid.org/0000-0002-2471-3932)
- He Zhu (ORCID: https://orcid.org/0000-0001-9634-6951)
- Minghu Fang (ORCID: https://orcid.org/0000-0002-6514-1168)
- Yihui Zhai (ORCID: https://orcid.org/0000-0001-7593-5538)
- Hanguang Gou
- Huizhen Wu (ORCID: https://orcid.org/0000-0001-5858-1969)
- Sihan Zhao (ORCID: https://orcid.org/0000-0003-2162-734X)
- Nasir Ali (ORCID: https://orcid.org/0000-0001-5028-4265)
- Haiming Zhu (ORCID: https://orcid.org/0000-0001-7747-9054)
- Weien Lai (ORCID: https://orcid.org/0000-0002-8119-4868)
- Yusong Sheng (ORCID: https://orcid.org/0000-0003-1114-8943)
- Zhou Zhou (ORCID: https://orcid.org/0009-0000-2359-1534)
- Jiaqi Zhu (ORCID: https://orcid.org/0000-0003-0256-6924)
- Chunxiang Wu
- Mengjuan Liu
- Xuefeng Luo
- Ziyang Ren (ORCID: https://orcid.org/0009-0008-8159-4096)
- Yao Wang (ORCID: https://orcid.org/0000-0002-1690-0738)
Institutions
- Hefei University of Technology (CN)
- Jiaxing University (CN)
- Zhejiang Lab (CN)
- University of Chinese Academy of Sciences (CN)
- Zhejiang University (CN)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2024-08-29
- DOI
- https://doi.org/10.1002/adfm.202404974
- Citations
- 3
- Primary Topic
- Advanced Semiconductor Detectors and Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.63
Funders
- National Natural Science Foundation of China
- Chinesisch-Deutsche Zentrum für Wissenschaftsförderung
- National Key Research and Development Program of China
- Natural Science Foundation of Zhejiang Province