360° omnidirectional, printable and transparent photodetectors for flexible optoelectronics

Der-Hsien Lien, Hsin Ping Wang, Shih Bin Chen, Yu Chieh Chi, Chung Lun Wu, Gong Ru Lin, Ying Chih Liao, Jr Hau He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Flexible optoelectronics that can be bent, wrapped, and stretched have attracted interest for wearable and mobile applications. In this work, we demonstrate a transparent 360° omnidirectional photodetector (PD) that can be stretched and wrapped around flexible or curved substrates. By embedding interlaced ZnO and Ag nanowires (NWs) in thermoplastic polyurethane via inkjet printing, the device featured > 75% transmittance in the visible region, showing high photoresponsivity and response time (10–30 A/W and 0.8 s, respectively). Moreover, the flexible PD performs well under deformation (only 9% decay in the photocurrent under 60% strain and 8% loss when the device is bent at a radius of 5 mm), which allows it to be readily applied on curved surfaces, such as skin or optical fibers. This study opens the door for the development of flexible optoelectronics that could be implemented in fiber optics, wearable electronics, self-powered systems, bio-signal monitors, and epidermal electronics.

Original languageEnglish
Article number19
Journalnpj Flexible Electronics
Issue number1
StatePublished - 1 Dec 2018


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