Effect of blending polymer insulators on the improvement of the performance of poly(3-hexylthiophene) transistors

Ming Tzu Chung, Zhong En Tsay, Ming Han Chi, Yu Wu Wang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study investigated the correlations between the microstructure and electrical properties of regioregular poly(3-hexylthiophene) (rr-P3HT) blended with polystyrene, poly(vinyl phenol), or poly(methyl methacrylate) (PMMA) thin-film transistors (TFTs). Compared with pure rr-P3HT TFT, the blended rr-P3HT TFTs exhibited superior characteristics such as higher on/off current ratio of approximately 104, lower leakage current of < 10− 11 A, smaller sub-threshold swing of approximately 2.09 V/dec, and higher mobility of approximately 8.18 × 10− 3 cm2/Vs. The suppression of the leakage current of the sub-threshold and off regimes may be attributed to the enhanced oxygen/humidity resistance of blended rr-P3HT TFTs. The evaluation of the physical properties showed that polymer insulators positively contributed to the morphology, molecular orientation, and effective conjugated length of the rr-P3HT film, thereby enhancing the device characteristics. The hybrid Al2O3/PMMA gate insulator was also utilized to apply low-voltage TFTs with rr-P3HT/polymer blends and yielded a low operation voltage of − 2 V.

Original languageEnglish
Pages (from-to)441-447
Number of pages7
JournalThin Solid Films
Volume638
DOIs
Publication statusPublished - 2017 Sep 30

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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