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3-Color Photodetector Explored for IR Color TV

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A three-color, shortwave-midwave-longwave IR photodetector could be used to create IR color televisions and imaging systems.

"A device capable of detecting different IR wavebands is highly desirable in next-generation IR imaging systems," said professor Manijeh Razeghi of Northwestern University.

Razeghi and her team invented and investigated the design for three-color photodiodes without using additional terminal contacts. The resulting device is based on InAs/GaSb/AlSb type-II superlattices. As the applied bias voltage varied, the photodetector sequentially exhibited the behavior of three different colors, corresponding to the bandgap of three absorbers, and achieved well-defined cut-off wavelengths and high-quantum efficiency in each channel, the researchers said.

This research, published in Scientific Reports (doi: 10.1038/srep24144) builds on the Razeghi group's many years of work in Northwestern's Center for Quantum Devices, including the development of the first single-color, short-wavelength IR photodetector and two-color, shortwave-midwave IR photodetector based on type-II superlattices.
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Published: May 2016
Glossary
infrared
Infrared (IR) refers to the region of the electromagnetic spectrum with wavelengths longer than those of visible light, but shorter than those of microwaves. The infrared spectrum spans wavelengths roughly between 700 nanometers (nm) and 1 millimeter (mm). It is divided into three main subcategories: Near-infrared (NIR): Wavelengths from approximately 700 nm to 1.4 micrometers (µm). Near-infrared light is often used in telecommunications, as well as in various imaging and sensing...
photodetector
A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical signal. Photodetectors are widely used in various applications, ranging from simple light sensing to more complex tasks such as imaging and communication. Key features and principles of photodetectors include: Light sensing: The primary function of a photodetector is to sense or detect light. When photons (particles of light) strike the active area of the photodetector,...
photodiode
A two-electrode, radiation-sensitive junction formed in a semiconductor material in which the reverse current varies with illumination. Photodiodes are used for the detection of optical power and for the conversion of optical power to electrical power. See avalanche photodiode; PIN photodiode.
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