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- Title
H-BN-Encapsulated Uncooled Infrared Photodetectors Based on Tantalum Nickel Selenide.
- Authors
Zhang, Shi; Han, Li; Xiao, Kening; Zhang, Libo; Shi, Chaofan; Xu, Leijun; Deng, Ke; Zou, Yuanchen; Jiang, Mengjie; Lv, Xuyang; Zhu, Yulin; Li, Qing; Liu, Changlong; Tang, Weiwei; Li, Guanhai; Ding, Songyuan; Chen, Xiaoshuang; Lu, Wei
- Abstract
Uncooled broadband spectrum detection, spanning from visible to mid-wave-infrared regions, offers immense potential for applications in environmental monitoring, optical telecommunications, and radar systems. While leveraging proven technologies, conventional mid-wave-infrared photodetectors are encumbered by high dark currents and the necessity for cryogenic cooling. Correspondingly, innovative low-dimensional materials like black phosphorus manifest weak photoresponse and instability. Here, tantalum nickel selenide (Ta2NiSe5) infrared photodetectors with an operational wavelength range from 520 nm to 4.6 μm, utilizing a hexagonal boron nitride (h-BN) encapsulation technique are introduced. The h-BN encapsulated metal-Ta2NiSe5-metal photodetector demonstrates a responsivity of 0.86 A W-1, a noise equivalent power of 1.8 X 10-11 W Hz-1/2, and a peak detectivity of 8.75 X 108 cm Hz1/2 W-1 at 4.6 μη under ambient conditions. Multifaceted mechanisms of photocurrent generation in the novel device prototype subject are scrutinized to varying wavelengths of radiation, by characterizing the temporal-, bias-, power-, and temperature-dependent photoresponse. Moreover, the photopolarization dependence is delved and concealed-target imaging is demonstrated, which exhibits polarization angle sensitivity and high-fidelity imaging across the visible, short-wave, and mid-wave-infrared bands. The observations, which reveal versatile detection modalities, propose Ta2NiSe5 as a promising low-dimensional material for advanced applications in nano-optoelectronic device.
- Subjects
PHOTODETECTORS; NICKEL; BORON nitride; BREWSTER'S angle; ENVIRONMENTAL monitoring; TANTALUM
- Publication
Advanced Functional Materials, 2023, Vol 33, Issue 48, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202305380