Abstract
We propose a flexible proximity sensor to detect sub-centimeter distance with an ultra-high displacement resolution. The proximity sensor is realized by integrating a semi-transparent organic photo detector with a transparent top electrode and a finger-type bottom electrode. By placing the semi-transparent finger-type photodetector on a light source, such as a light-emitting diode (LED), the photodetector can detect the light reflected from an object on top of the sensor. With the highly compact structure, the detecting range is from 1 mm to 30 mm. From 1 mm to 10 mm, the sensor is particularly sensitive and delivers a resolution of 1 mm. The air-stable photodetector can also be fabricated on a flexible substrate without encapsulation, enabling the integration with arbitrary light sources. After 1000 times bending, the flexible photodetector shows no obvious degradation.
Original language | English |
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Pages (from-to) | 305-312 |
Number of pages | 8 |
Journal | Organic Electronics |
Volume | 49 |
DOIs | |
State | Published - 1 Oct 2017 |
Keywords
- Finger-type
- Flexible
- Organic photodetector
- Proximity sensor
- Solution-processed