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Detectivities of WS2/HfS2 heterojunctions

Nature Nanotechnology volume 17, pages 217–219 (2022)Cite this article

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Matters Arising to this article was published on 10 March 2022

The Original Article was published on 29 June 2020

arising from Lukman et al. Nature Nanotechnology https://doi.org/10.1038/s41565-020-0717-2 (2020)

In the past decade a new class of two-dimensional (2D) materials have emerged as potentially strong competitors of HgCdTe. Several papers have announced record detectivities of heterojunction 2D material photodetectors operated at room temperature in the long wavelength infrared (LWIR) spectral region1,2,3. Recently, Lukman et al.4 presented a remarkably high background-limited performance (BLIP) (for a 2π field of view (FOV) and 300 K background) at room temperature in the spectral region of 5–8 μm. However, the relative magnitude of this was not noticed by the authors. Note that the BLIP performance is ultimately limited in the sense that it does not arise from any imperfection in the detector or its associated electronics, but rather from the detection process itself (the photon noise of the background), as a result of a discrete nature of the radiation field.

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Fig. 1: The spectral dependence of the detectivity of HOT HgCdTe photodiodes and different types of 2D material photodetectors.

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  1. Institute of Applied Physics, Military University of Technology, Warsaw, Poland

    A. Rogalski

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Nature Nanotechnology thanks Longhui Zeng and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Rogalski, A. Detectivities of WS2/HfS2 heterojunctions. Nat. Nanotechnol. 17, 217–219 (2022). https://doi.org/10.1038/s41565-022-01076-6

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