Abstract
Infrared (IR) cameras based on semiconductors grown by epitaxial methods face two main challenges, which are cost and operating at room temperature. The alternative new technologies which can tackle these two difficulties develop new and facile material and methods. Moreover, the implementation of high speed camera, which makes high resolution images with normal methods, is very expensive. In this paper, a new nanostructure based on a cost-effective solution processed technology for the implementation of the high-speed mid-infrared light camera at room temperature is proposed. To this end, the chemically synthesized PbSe–PbI2 core–shell Quantum Dots (QDs) are used. In this work, a camera including 10 × 10 pixels is fabricated and synthesized QDs spin-coated on interdigitated contact (IDC) and then the fabricated system passivated by epoxy resin. Finally, using an electronic reading circuit, all pixels are converted to an image on the monitor. To model the fabricated camera, we solved Schrodinger–Poisson equations self consistently. Then output current from each pixel is modeled based on semiconductor physics and dark and photocurrent, as well as Responsivity and Detectivity, are calculated. Then the fabricated device is examined, and dark and photocurrents are measured and compared to the theoretical results. The obtained results indicate that the obtained theoretical and measured experimental results are in good agreement together. The fabricated detector is high speed with a rise time of 100 ns. With this speed, we can get 10 million frames per second; this means we can get very high-resolution images. The speed of operation is examined experimentally using a chopper that modulates input light with 50, 100, 250, and 500 Hz. It is shown that the fabricated device operates well in these situations, and it is not limited by the speed of detector. Finally, for the demonstration of the proposed device operation, some pictures and movies taken by the camera are attached and inserted in the paper.
Highlights
Night Vision technology provides the ability to see in darkness, and a long way has been passed in the development of this technology from the 1950s
Night vision cameras mostly work in two main ways: Image enhancement and Thermal imaging
It is an electro-optical device which consists of three main components, a photocathode, a Microchannel Plate (MCP), and a phosphor screen, which amplifies the ambient light to achieve better v ision[5,6,7]
Summary
Night Vision technology provides the ability to see in darkness, and a long way has been passed in the development of this technology from the 1950s. Mobility or carrier density in the semiconductor changes, and subsequently, the conductivity of the material will change that causes an alteration in output electrical s ignal[11]. Following this concept, by using this type of photodetectors for the proposed camera, the output electric signals are sent to a signal-processing unit that transforms information from the photodetectors into data for the display. Because of the these advantages, QD photodetectors are preferred in many applications at room temperature, and increasing the effective light detection area per each pixel makes them suitable for imaging devices[19]
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