High-resolution proximity sensor using flexible semi-transparent organic photo detector

Chao Hsuan Chen, Ching Fu Lin, Kuan Hsun Wang, Hung Chuan Liu, Hsiao-Wen Zan*, Hsin-Fei Meng, Wilfried Hortschitz, Harald Steiner, Andreas Kainz, Thilo Sauter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 languageEnglish
Pages (from-to)305-312
Number of pages8
JournalOrganic Electronics
StatePublished - 1 Oct 2017


  • Finger-type
  • Flexible
  • Organic photodetector
  • Proximity sensor
  • Solution-processed


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