High temperature-stability of organic thin-film transistors based on quinacridone pigments


Kanbur Y. , Coskun H., Glowacki E. D. , Irimia-Vladu M., Sariciftci N. S. , Yumusak C.

Organic Electronics, cilt.66, ss.53-57, 2019 (SCI Expanded İndekslerine Giren Dergi)

  • Cilt numarası: 66
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.orgel.2018.12.004
  • Dergi Adı: Organic Electronics
  • Sayfa Sayısı: ss.53-57

Özet

Robust organic thin-film transistors (OTFTs) with high temperature stability allow device integration with mass production methods like thermoforming and injection molding, and enable operation in extreme environment applications. Herein we elaborate a series of materials to make suitable gate dielectric and active semiconductor layers for high temperature stable OTFTs. We employ an anodized aluminum oxide layer passivated with cross-linked low-density polyethylene (LD-PE) to form a temperature-stable gate capacitor. As the semiconductor, we use quinacridone, an industrial organic colorant pigment produced on a mass scale. Evaporated MoOx/Ag source and drain electrodes complete the devices. Here we evaluate the performance of the OTFTs healing them in air from 100 degrees C in 25 degrees C increments up to 225 degrees C, holding each temperature for a period of 30 minutes. We find large differences in stability between quinacridone and its dimethylated derivative, with the former showing the best performance with only a factor of 2 decline in mobility after healing at 225 degrees C, and unaffected on/off ratio and threshold voltage. The approach presented here shows how industriallys calable fabrication of thermally robust OTFTs can be rationalized.