Black phosphorus (BP), a narrow band gap semiconductor without out-of-plane dangling bonds, has shown promise for broadband and integrable photodetector applications. Simultaneously exhibiting high speed and high-efficiency operation, however, remains a critical challenge for current BP-based photodetectors. Here, we demonstrate a photodetector based on the BP-based van der Waals heterostructures. The developed photodetector enables broadband responses in the visible to mid-infrared range with external quantum efficiency ranging from 20 to 52% at room temperature. These results together with noise measurements indicate that the photodetector can detect light in the picowatt range. Furthermore, the demonstrated BP detector has ultrafast rise (1.8 ns) and fall (1.68 ns) times, and its photoresponse exhibits reproducible switching behavior even under consecutive and rapid light intensity modulations (2100 cycles, 200 MHz), as indicated by the eye-diagram measurement. By leveraging these features, we show our BP heterostructures can be configured as a point-like detector in a scanning confocal microscopy, useful for mid-infrared imaging applications.
- Ultra-Broadband, High Speed, and High-Quantum-Efficiency Photodetectors Based on Black Phosphorus
- Ultra-Broadband, High Speed, and High-Quantum-Efficiency Photodetectors Based on Black Phosphorus
- Tian-Yun Chang (Author) - National Tsing Hua UniversityPo-Liang Chen (Author)Jhih-Heng Yan (Author) - National Tsing Hua UniversityWei-Qing Li (Author)Ya-Yun Zhang (Author) - National Tsing Hua UniversityDe-In Luo (Author) - National Tsing Hua UniversityJia-Xin Li (Author)Kun-Ping Huang (Author) - Mechanical and Mechatronics Systems Research Laboratories , Industrial Technology Research InstituteChang-Hua Liu (Author)
- Journal article
- 01/2020
- ACS applied materials & interfaces, Vol.12(1), pp.1201-1209
- English