Science China Materials

, Volume 62, Issue 1, pp 138–145 | Cite as

Grain size adjustion in organic field-effect transistors for chemical sensing performance improvement

  • Xiaohan Wu (吴小晗)
  • Rongrong Du (都蓉蓉)
  • Lu Fang (方路)
  • Yingli Chu (褚莹莉)
  • Zhuo Li (李卓)
  • Jia Huang (黄佳)Email author


Various nanostructures of the organic semiconductor (OSC) films have been reported to enhance the organic field-effect transistors (OFETs) sensing performance. However, complicated fabrication processes hinder their applications. In this work, we have effectively enhanced the sensitivity of the OFET-based sensors only by adjusting substrate temperature in OSC preparation and surface treatment of the dielectric layer. The relative sensitivity of the device can be enhanced by 5 times. The flexible sensors with polymer dielectric also exhibit high sensitivity because the less smooth surface of the polymer provides the OSCs with smaller grain size. Therefore, this work reveals the trade-off effects of the OSCs grain size on both transistor characteristic and chemical sensing performance, and provides a simple and extensively applicable strategy for OFETs sensitivity improvement.


grain size organic semiconductor OFET chemical sensor performance improvement 



基于有机场效应晶体管(OFET)的化学传感器, 分析物在与位于有机半导体(OSC)薄膜底部的导电沟道发生相互作用之前需要扩散通过整层OSC, 从而大大地限制了器件的灵敏度. 虽然通过设计各种纳米结构OSC薄膜来提高器件传感性能的方法见诸报道, 然而, 这些纳米结构的制备过程复杂且不能广泛适用于种类繁多的OSC材料. 本文首先研究了OSC晶粒尺寸对OFET化学传感器灵敏度的影响, 结果表明更小的晶粒尺寸能为化学分析物的扩散提供更多的空间间隙, 从而有利于提高器件灵敏度. 基于此, 我们通过简单地调控OFET的制备参数, 包括OSC薄膜蒸镀过程中的基板温度, OFET基底的表面处理程度等参数, 将传感器的相对灵敏度提高了5倍. 基于聚合物介电层的柔性传感器也表现出较好的灵敏度. 该工作揭示了OSC晶粒尺寸对器件晶体管性能和传感器性能的互不相同的影响, 并且为提高OFET化学传感器性能提供了一种简便且广适性的策略.



This research was supported by the National Natural Science Foundation of China (51603151 and 51741302), the National Key Research and Development Program of China (2017YFA0103900 & 2017YFA0103904), Science & Technology Foundation of Shanghai (17JC1404600), and the Fundamental Research Funds for the Central Universities.

Supplementary material

40843_2018_9279_MOESM1_ESM.pdf (1.3 mb)
Grain Size Adjustion in Organic Field-effect Transistors for Chemical Sensing Performance Improvement


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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiaohan Wu (吴小晗)
    • 1
  • Rongrong Du (都蓉蓉)
    • 1
  • Lu Fang (方路)
    • 1
  • Yingli Chu (褚莹莉)
    • 1
  • Zhuo Li (李卓)
    • 2
  • Jia Huang (黄佳)
    • 1
    Email author
  1. 1.School of Materials Science and EngineeringTongji UniversityShanghaiChina
  2. 2.State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and EngineeringTongji UniversityShanghaiChina

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