Eco-friendly and biodegradable biopolymer chitosan/Y2O3 composite materials in flexible organic thin-film transistors

Bo Wei Du, Shao Ying Hu, Ranjodh Singh, Tsung Tso Tsai, Ching Chang Lin*, Fu-Hsiang Ko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The waste from semiconductor manufacturing processes causes serious pollution to the environment. In this work, a non-toxic material was developed under room temperature conditions for the fabrication of green electronics. Flexible organic thin-film transistors (OTFTs) on plastic substrates are increasingly in demand due to their high visible transmission and small size for use as displays and wearable devices. This work investigates and analyzes the structured formation of aqueous solutions of the non-toxic and biodegradable biopolymer, chitosan, blended with high-k-value, non-toxic, and biocompatible Y2O3 nanoparticles. Chitosan thin films blended with Y2O3 nanoparticles were adopted as the gate dielectric thin film in OTFTs, and an improvement in the dielectric properties and pinholes was observed. Meanwhile, the on/off current ratio was increased by 100 times, and a low leakage current was observed. In general, the blended chitosan/Y2O3 thin films used as the gate dielectric of OTFTs are non-toxic, environmentally friendly, and operate at low voltages. These OTFTs can be used on surfaces with different curvature radii because of their flexibility.

Original languageEnglish
Article number1026
Issue number9
StatePublished - 3 Sep 2017


  • Chitosan
  • Flexible
  • Non-toxic
  • Organic thin-film transistors (OTFTs)
  • YO

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