THE PORTAL OF NEWS RELEATED TO NOKIA
That the best camera fitted on a smartphone ever can be found on the Nokia 808 PureView, Nokia thinking of ways to get those sensors even smaller, and one way to achieve that might be through making them out of graphene. In fact, Nokia has been given a patent for a camera sensor that uses one or several graphene photo-sensitive layers instead of the widely used CMOS technology.
“The patent describes photo-detector/pixel with graphene photon collecting layer, a number of finger shaped electrodes placed above it to collect electrons-holes generated by passing light photons, a graphene nano-ribbon acting as field effect transistor to amplify the resulting current and transfer it to the connected control electronics. Several light detecting and amplifier layers can be stacked on top of each other, with color filters in between, so different colors can easily be detected by each pixel in the sensor.”
If anyone is thinking that, why is grapheme for the sensor then the simple answer to this question is that, because of its transparency. Only 2.3% of the passing light is absorbed by this single layer of carbon cells, and the whole process of filtering light is even all across the whole light spectrum. This is the main reason why Nokia believes that this sensor would perform much better than its CMOS sensors in low light conditions.
Graphene is an allotrope of carbon and its 2D structure measures just one atom thick. While being thin, it’s the strongest material ever tested, having a breaking strength 300 times greater than steel and is also the lightest material ever, best intrinsic conductor and super-flexible, too. It’s predicted to replace silicon as the base for all electronics. Therefore, these new sensors should excel at capturing images in low light conditions.
Yet, this here is just a patent. It is way too early to talk about cameraphones with graphene sensors, especially when graphene has not exactly hit the mainstream just yet.
As it happens with many otherwise cool patents, this one might never end up being used in a commercial product. On the other hand, it is nice to know that today’s companies are thinking out of the box and developing what might one day be the next generation of image sensors.
You can have more info : http://www.graphene-info.com/