Liquid crystal-gated organic field-effect transistors and synaptic behavior simulation

Yun-feng ZHANG; Feng GE; Long-zhen QIU; Xiao-hong WANG

doi:10.3788/YJYXS20183306.0451

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Liquid crystal-gated organic field-effect transistors and synaptic behavior simulation

Material and Device | 更新时间：2020-07-06

- Liquid crystal-gated organic field-effect transistors and synaptic behavior simulation
- Chinese Journal of Liquid Crystals and Displays Vol. 33, Issue 6, Pages: 451-456(2018)
- 作者机构：
  
  特种显示技术国家工程实验室, 现代显示技术省部共建国家重点实验室培育基地, 合肥工业大学光电技术研究院, 安徽合肥 230009
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20183306.0451
  CLC： TN141.9
- Received：19 January 2018，
  
  Accepted：07 February 2018，
  
  Published：2018-06
- 稿件说明：
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Yun-feng ZHANG, Feng GE, Long-zhen QIU, et al. Liquid crystal-gated organic field-effect transistors and synaptic behavior simulation[J]. Chinese journal of liquid crystals and displays, 2018, 33(6): 451-456.
DOI：

Yun-feng ZHANG, Feng GE, Long-zhen QIU, et al. Liquid crystal-gated organic field-effect transistors and synaptic behavior simulation[J]. Chinese journal of liquid crystals and displays, 2018, 33(6): 451-456. DOI： 10.3788/YJYXS20183306.0451.

摘要

采用液晶E7作为栅介质，聚异靛蓝噻吩乙烯噻吩（PⅡ-TVT）作为半导体，利用光刻/蚀刻技术制备了漏极-源极-栅极（D-S-G）共面的有机场效应晶体管器件，并测试了晶体管性能，对液晶作为栅介质应用于有机场效应晶体管进行研究。实验结果表明，器件表现出比较特别的晶体管性能，开关比达到10

。通过光学显微镜观察发现，施加栅极电压后液晶发生形变，表明栅极电压对电极上的液晶分子的取向排列有较大影响。在施加脉冲栅压时，沟道电流随着脉冲栅压时间的延长而增强。利用液晶分子在电场下发生极化和迟滞作用，可一定程度上模拟突触的刺激时间依赖性。

Abstract

Novel organic field-effect transistor (OFET) devices with drain-source-gate (D-S-G) coplanar configuration are fabricated by using E7 liquid crystal as a gate insulator and PⅡ-TVT as active layer

through typical photolithography/etching processes

in order to prepare an OFET with liquid crystal as the gate insulator. The transistor performance was measured and experimental results indicated that the device showed some special untypical transistor performance with

off

could be up to 10

.From optical microscope images

it was observed that the liquid crystal was deformed upon the applied gate voltage

which manifested that the gate voltage has a greater impact on the alignment of the liquid crystal molecules. When the pulse gate voltage is applied

the channel current increase with the time of pulse gate voltage. Therefore

the polarization and relaxation of liquid crystal molecules under the electric field partially simulate the spike-time-dependent plasticity of synapse.

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Keywords

references

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