Novel Organic Photo Detectors developed for On-Skin Medical Diagnostic

Published By : 24 Sep 2018 | Published By : QYRESEARCH

Science and technology has touched the sky and beyond. With the invention of light bulb of the Edison times to current day of Artificial Intelligence, Science has done all wonders. One of the latest magical gift of science to us is the invention of ultra-thin photo detectors that can be worn in the skin and be used for measuring the various blood flow characteristics in patients. 

Scientists of the RIKEN Research Center, Japan, developed an organic ultra-thin photo detector that is wearable on one’s fingertips and may be used as a highly sensitive sensor of blood flow. This plastic film is so thin that it can be bend numerous times without affecting its ability to detect light. It is thinner than a human hair and is comfortable for patients in terms of its wearability unlike that of silicon and other materials.

Organic Photo Detector Sensor - Twist and Flex Proof

The sensor is based on a mass heterojunction photovoltaic active layer and this layer consists of regioregular polyindacenodithiophene?pyridyl [2, 1, 3] thiadiazole?cyclopentadithiophene (PIPCP). The active layer delivers unusual operational stability even under severe mechanical deformation with more number of bending cycles. It is presented in the form of soft sheets consisting of organic molecules that can even bend or flex according to the body movements.

Owing to the device component structure of the ultrathin device, which is layer by layer, it was easy to locate them in a neutral plane where the stress is minimal and the device can still perform under severe mechanical deformation of the body. The polymer’s slim form allowed it to eliminate artifacts caused by the movements and attach firmly to curved body parts while used in diagnostic applications. When experimented on a volunteer, the polymer was attached to his fingertips and it was observed that the device measured the flow of blood manipulating infrared light even after it was compressed to become half of its original size.

The research team further plans to amalgamate such photo detectors with organic power sources, processors and light-emitting diodes to perceive self-powered sensor systems. With time, science and technology has advanced to the extent that now nothing seems impossible. It has been truly said, “The science of today is the technology of tomorrow”.

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