Picoampere Dark Current and Electro-opto-coupled Sub-to-Super-linear response from Mott-transition enabled Infrared Photodetector for Near-sensor Vision processing.

Light-intensity selective superlinear photodetectors with ultralow dark current can provide an essential breakthrough for the development of high-performing near-sensor vision processing. However, the development of near-sensor vision processing is not only conceptually important for device operation (given that sensors naturally exhibit linear/sublinear responses), but also essential to get rid of the massive amount of data generated during object sensing and classification with noisy inputs. Therefore, achieving the giant superlinear photoresponse while maintaining the picoampere leakage current, irrespective of the measurement bias, is one of the most challenging tasks. Here, we developed Mott material (vanadium dioxide) and silicon-based integrated infrared photodetectors that show giant superlinear photoresponse (exponent >18) and ultralow dark current of 4.46 pA. Specifically, the device demonstrates an electro-opto-coupled insulator-to-metal transition, which leads to outstanding photocurrent on/off ratio (>10 6 ), a high responsivity (> 1 mA/W), and excellent detectivity (>10 12 Jones), while maintaining response speed (τ r = 6 μs and τ f = 10 μs). Further, we demonstrate intensity-selective near-sensor processing and exhibit night vision pattern reorganization even with noisy inputs. This research will pave the way for the creation of high-performance photodetectors with potential uses, such as in night vision, pattern recognition, and neuromorphic processing. This article is protected by copyright. All rights reserved.