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A research team led by Prof. CAO Hongtao at the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences, in cooperation with Prof. ZHANG Haizhong’s group from Fuzhou University, has developed a novel bioinspired vision sensor based on InP quantum dots (QDs)/oxide thin-film phototransistors.
The study was published in Advanced Functional Materials (« InP Quantum Dots Tailored Oxide Thin Film Phototransistor for Bioinspired Visual Adaptation »).
Artificial visual system has a broad application prospect in the security, medical care, service and other fields. However, massive and surging visual data pose a great challenge to the traditional artificial visual system which is trapped by latency and energy consumption problems.
Adaptive phototransistors play a vital role in improving the efficiency of visual information processing. The researchers embed discrete InP QDs with strong visible-light absorbance within an InSnZnO thin film to construct a hybrid phototransistor, contributing to the efficient carrier transmission between the source and drain.
The excellent optoelectronic response capability of InP QDs and the superior electrical transport property of oxide semiconductors are perfectly combined in a single device.
In addition, the developed bioinspired vision sensor based on the InP QDs/oxide thin-film phototransistor exhibits excellent gate controllability and visible light response capability, thus mimicking multiple functions of the human visual system and adapting to varying ambient light intensity.
Moreover, the device achieved an impressive accuracy of more than 93% for handwritten pattern recognition, indicating its outstanding competence in image processing.
This study has provided an effective and facile way to fabricate high-performance phototransistors for bioinspired visual adaptation, and shed light on the further development of artificial vision systems.
Researchers from Virginia Tech’s Future Materials Laboratory and MInDS Laboratory have recently demonstrated that high-intensity focused ultrasound (HIFU) is a promising, non-invasive stimulus with multiple superior and unique capabilities to induce localized heating and achieve temporal and spatial thermal effects in polymers.
Lire la suiteSince its first demonstration in 2004, the large-scale commercial production of graphene has proven difficult and costly (‘large scale’ usually defined as weights more than 200 mg or films larger than 200 cm2). For instance, at an estimated cost of $50 000 to $200 000 per ton for graphene powders and $45 000 to $100 000 per m2 of graphene film, industrial production methods and costs are restraining graphene utility.
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