Active pixel sensor matrix based on monolayer MoS2 phototransistor array
Active pixel sensor matrix based on monolayer MoS2 phototransistor array
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DOI：
10.1038/s41563-022-01398-9
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发表时间：
2022-11-17
期刊：
影响因子：
41.2
通讯作者：
Das, Saptarshi
中科院分区：
文献类型：
--
作者：
Dodda, Akhil;Jayachandran, Darsith;Das, Saptarshi
低功率和紧凑的有源像素传感器（APS）矩阵是资源有限的边缘设备所期望的。在这里，作者报告了一种基于单层MoS 2光电晶体管阵列的小尺寸APS矩阵，其表现出光谱均匀性，可重构的光响应性和低能耗的去噪能力。传感器内处理可以减少许多机器视觉应用的能源和硬件负担，目前缺乏最先进的有源像素传感器（APS）技术。光敏和半导体二维（2D）材料可以通过在单个设备中集成图像捕获（感测）和图像处理（计算）功能来弥合这一技术差距。在这里，我们介绍了一种基于单层MoS 2光电晶体管阵列的2D APS技术，其中每个像素使用单个可编程光电晶体管，从而大大减少了占地面积（900像素，类似于0.09 cm（2））和能耗（每个像素100 fJ）。通过利用栅极可调的持久光电导性，我们实现了类似于3.6 × 10（7）A W-1的响应度，类似于5.6 × 10（13）Jones的比探测率，光谱均匀性，类似于80 dB的高动态范围和传感器内的降噪能力。此外，我们证明了在整个二维APS阵列的光响应接近理想的产量和均匀性。
Low-power and compact active pixel sensor (APS) matrices are desired for resource-limited edge devices. Here, the authors report a small-footprint APS matrix based on monolayer MoS2 phototransistors arrays exhibiting spectral uniformity, reconfigurable photoresponsivity and de-noising capabilities at low energy consumption.In-sensor processing, which can reduce the energy and hardware burden for many machine vision applications, is currently lacking in state-of-the-art active pixel sensor (APS) technology. Photosensitive and semiconducting two-dimensional (2D) materials can bridge this technology gap by integrating image capture (sense) and image processing (compute) capabilities in a single device. Here, we introduce a 2D APS technology based on a monolayer MoS2 phototransistor array, where each pixel uses a single programmable phototransistor, leading to a substantial reduction in footprint (900 pixels in similar to 0.09 cm(2)) and energy consumption (100s of fJ per pixel). By exploiting gate-tunable persistent photoconductivity, we achieve a responsivity of similar to 3.6 x 10(7) A W-1, specific detectivity of similar to 5.6 x 10(13) Jones, spectral uniformity, a high dynamic range of similar to 80 dB and in-sensor de-noising capabilities. Further, we demonstrate near-ideal yield and uniformity in photoresponse across the 2D APS array.