Gate-tunable in-sensor computing vdW heterostructures for infrared photodetection

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Infrared Physics & Technology Pub Date : 2024-10-28 DOI:10.1016/j.infrared.2024.105611
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Abstract

Convolutional preprocessing is feasible for feature extraction and accurate recognition. In-sensor computing, which requires a photodetector with a computation function, is a potential candidate for hardware-implemented preprocessing. However, limited by the high carrier concentration in infrared sensing materials, reconfigurable manipulation of photocarriers is hardly complemented. Thus, previous works mostly focused on preprocessing in the visible range. Here, we propose a gate-tunable BP/MoS2 heterostructure. With an elaborate design on the material’s thickness, the depletion region can be precisely controlled, resulting in multiple and reconfigurable responsivity states. With a sharp and clean interface, our device shows strong linear dependence over the broadband spectrum, which is the prerequisite for constructing convolutional kernels. Furthermore, observing the maximum photocurrent in the Vg sweeping process demonstrates strong regulation of carrier concentration in the infrared sensing material, BP layer. Since it has superior performance in high linearity and multiple states construction, our device is suitable for realizing computation in photodetector for convolutional preprocessing, underscoring its superiority in intelligent infrared perception and preprocessing.
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用于红外光探测的栅极可调谐传感器内计算 vdW 异质结构
卷积预处理对于特征提取和准确识别是可行的。传感器内计算需要一个具有计算功能的光电探测器,是硬件实施预处理的潜在候选方案。然而,受限于红外传感材料中的高载流子浓度,光载流子的可重构操作很难得到补充。因此,以前的工作主要集中在可见光范围内的预处理。在这里,我们提出了一种栅极可调谐 BP/MoS2 异质结构。通过对材料厚度的精心设计,耗尽区可以得到精确控制,从而产生多种可重新配置的响应状态。由于界面清晰整洁,我们的器件在宽带光谱上显示出很强的线性依赖性,这是构建卷积核的先决条件。此外,通过观察 Vg 扫频过程中的最大光电流,我们还发现红外传感材料 BP 层中的载流子浓度具有很强的调节能力。由于该器件在高线性度和多态构建方面表现出色,因此适合在光电探测器中实现用于卷积预处理的计算,从而凸显其在智能红外感知和预处理方面的优越性。
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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
期刊最新文献
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