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Efficient n-Type Small-Molecule Mixed Ion-Electron Conductors and Application in Hydrogen Peroxide Sensors.

Hailiang LiaoJunxin ChenLiuyuan LanYaping YuGenming ZhuJiayao DuanXiuyuan ZhuHaojie DaiMingfei XiaoZhengke LiWan YueIain McCulloch
Published in: ACS applied materials & interfaces (2022)
Small-molecule semiconductors used as the channel of organic electrochemical transistors (OECTs) have been rarely reported despite their inherent advantages of well-defined molecular weight, convenient scale-up synthesis, and good performance reproducibility. Herein, three small molecules based on perylene diimides are readily prepared for n-type OECTs. The final molecules show preferred energy levels, tunable backbone conformation, and high film crystallinity, rendering them good n-type dopability, favorable volumetric capacities, and substantial electron mobilities. Consequently, the OECTs afford a record-low threshold voltage of 0.05 V and a normalized peak transconductance of 4.52 × 10 -2 S cm -1 , as well as impressive long-term cycling stability. Significantly, the OECTs utilized for hydrogen peroxide sensing are further demonstrated with a detection limit of 0.75 μM. This work opens the possibility of developing nonfullerene small molecules as superior n-type OECT materials and provides important insights for designing high-performance small-molecule mixed ion-electron conductors for OECTs and (bio)sensors.
Keyphrases
  • hydrogen peroxide
  • small molecule
  • nitric oxide
  • solar cells
  • protein protein
  • gold nanoparticles
  • ionic liquid
  • room temperature
  • quantum dots
  • crystal structure