Yan Wei, Shresha Vivek Raj, Jeangros Quentin, Azar Nima Sefidmooye, Balendhran Sivacarendran, Ballif Christophe, Crozier Kenneth, Bullock James
Department of Electrical and Electronic Engineering, University of Melbourne, Melbourne, Victoria 3010, Australia.
School of Physics, University of Melbourne, Melbourne, Victoria 3010, Australia.
ACS Nano. 2020 Oct 27;14(10):13645-13651. doi: 10.1021/acsnano.0c05751. Epub 2020 Sep 29.
Thin two-dimensional (2D) material absorbers have the potential to reduce volume-dependent thermal noise in infrared detectors. However, any reduction in noise must be balanced against lower absorption from the thin layer, which necessitates advanced optical architectures. Such architectures can be particularly effective for applications that require detection only within a specific narrow wavelength range. This study presents a Fabry-Pérot cavity enhanced bP/MoS midwave infrared (MWIR) photodiode. This simple structure enables tunable narrow-band (down to 0.42 μm full width at half-maximum) photodetection in the 2-4 μm range by adjusting the thickness of the Fabry-Pérot cavity resonator. This is achieved while maintaining room-temperature performance metrics comparable to previously reported 2D MWIR detectors. Zero bias specific detectivity and responsivity values of up to 1.7 × 10 cm Hz W and 0.11 A W at λ = 3.0 μm are measured with a response time of less than 3 ns. These results introduce a promising family of 2D detectors with applications in MWIR spectroscopy.
二维（2D）薄材料吸收体有潜力降低红外探测器中与体积相关的热噪声。然而，噪声的任何降低都必须与薄层较低的吸收率相平衡，这就需要先进的光学架构。这种架构对于仅需要在特定窄波长范围内进行探测的应用可能特别有效。本研究展示了一种法布里 - 珀罗腔增强的bP/MoS中波红外（MWIR）光电二极管。这种简单结构通过调整法布里 - 珀罗腔谐振器的厚度，能够在2 - 4μm范围内实现可调谐窄带（半高宽低至0.42μm）光电探测。在保持室温性能指标与先前报道的2D MWIR探测器相当的情况下实现了这一点。在λ = 3.0μm时，零偏置比探测率和响应度值分别高达1.7×10 cm Hz W和0.11 A W，响应时间小于3 ns。这些结果引入了一类有前景的2D探测器，可应用于MWIR光谱学。
