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Organic semiconductors: Applications in organic field-effect transistors and chemical sensors

Time: 9:30 AM

Date:Oct. 25th, 2012
Location: The Institute for Biomedical Engineering & Nano Science (iNANO), 67 Chifeng Road
Reporter: 黄佳博士
A particularly compelling application of Organic field-effect transistors (OFETs) is chemical sensing, which has obtained growing demand of detecting and monitoring gases and vapors for safety, health and environmental issues. The first part of this talk introduces the design and optimization of chemical sensors based on ultra-thin p-channel and n-channel OFETs responding to dimethyl methylphosphonate that simulates phosphonate nerve agents, and Dinitrotoluene that simulates Trinitrotoluene. Organic semiconductors and receptor materials were designed and synthesized to optimize sensor performance. The sensor performances were also optimized through different modifications. The selectivity of the devices was investigated by comparing responses upon exposure to different interference vapors with target vapors. The second part of the talk demonstrates a straightforward route to solve the challenging problem of enhancing the effective mobility in OFETs while keeping the on/off ratio sufficiently high. Solution processed organic field-effect transistors usually have high on/off ratios, but suffer from low mobilities; while transistors based on graphene usually exhibit very high mobilities but very low on/off ratios. We approached the aim by developing hybrid transistors incorporating both organic semiconductors and graphene. Compared against transistors with only pure organic semiconductors, our hybrid transistors exhibit up to 20 times higher effective mobilities, and yet they keep the on/off ratios comparable or even better. We expect that our approach is a general route to enhance the performance of OFETs, providing a low-cost avenue for enhancing OFET performance.

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