期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 1, 页码 1201-1209出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13472
关键词
black phosphorus; van der Waals heterostructures; photodetector; mid-infrared imaging broadband photoresponses; high speed
资金
- Ministry of Science and Technology of Taiwan [MOST 107-2112-M-007-002-MY3]
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.
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