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Revolutionary phototransistor

08.11.2015

The researchers promise to make a breakthrough in digital photography with the help of a new phototransistor that is ahead of all existing developments in every parameter, including light sensitivity and speed.

Researchers at the University of Wisconsin-Madison, USA, have developed the world's fastest and most responsive flexible phototransistor. The work was published in the journal Advanced Optical Materials.

According to researchers Zhenqiang Ma and Jung-Hun Seo, the new high-performance transistor far outperforms previous generations of transistors in every aspect, including response time and sensitivity. An important property of the new transistor is its small size, which makes it possible to create more compact devices.

The new phototransistor has a high sensitivity to light and at the same time demonstrates the ability to bend strongly without causing deformation and malfunction. Such properties have never been achieved simultaneously, Ma stressed.

Another important property of the new phototransistor is its design - light hits directly on an ultra-thin silicon membrane, which effectively absorbs light energy. No additional layers obstruct or block light like other phototransistors.

When creating the element, the inventors drew inspiration from the eye of a mammal. The transistor is made on a flexible basis and is able to capture barely visible light, converting it into electrical impulses in the same way as the eye of an animal does, which sees well in the dark.

The metal layer and electrodes located under the ultra-thin silicon membrane act as reflectors, which makes it possible to increase the absorption coefficient without the use of external devices to increase the luminous flux.

The achievement can significantly increase the performance of a number of products, such as digital cameras and video cameras, smoke detectors, night vision goggles, video surveillance systems and other products based on the measurement of light intensity.

For example, digital cameras equipped with a new type of phototransistor sensors will allow you to take brighter photos in dark rooms without using a flash and increasing the ISO sensitivity, which leads to noise. In addition, the smaller size of the transistors will allow devices to be made smaller and lighter without compromising image quality.

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