标题: 四点探针有机薄膜电晶体之气体感测研究
Study of Gas Sensing Ability on Gated-Four-Probes
作者: 吴文馨
冉晓雯
关键字: 有机薄膜电晶体;气体感测;四点探针;氨气;Organic Thin Film Transistors;Gas Sensing;Gated-Four-Probes;ammonia
公开日期: 2007
摘要: 在论文中,我们建立一个可定量控制气体浓度的感测系统,并利用具四点探针结构的有机薄膜电晶体进行氨气感测的研究。当氨气与有机薄膜电晶体反应时,电晶体的汲极电流会被减少、临界电压会往负值增加、但次临界摆幅几乎不受氨气的影响而改变。而由四点探针结构的量测显示,电晶体的薄膜电阻与接触电阻均随氨气浓度的提高而增加。而利用薄膜电阻所推算出来的本质载子迁移率也会因氨气浓度的提高而随之减少。最后则将探讨载子迁移率降低、临界电压往负值增加、及几乎不受氨气影响的次临界摆幅,并根据电晶体特性改变的结果,提出可能的反应机制。
In this thesis, we tried to construct a gas sensing system, in which we can control the gas concentration quantitatively; moreover we also utilized the gated-four-probes organic thin film transistor to investigate the NH3 gas-sensing experiment. When the NH3 gas was interacted with OTFT, it was found that the OTFT drain current will be reduced and the threshold voltage will be enlarged toward a negative value. However, the subthreshold swing was not changed significantly by the NH3 gas. From the analysis of gated-4-probes OTFT, both the film resistance and the contact resistance were increased with the raise of NH3 concentration. Additionally, the intrinsic field-effect mobility, which was estimated from the film resistance, was also reduced with the raise of NH3 concentration. Finally, the reduction of the mobility, the increase of the threshold voltage, and the almost unchanged subthreshold swing were discussed. A probable mechanism deduced from the change of the OTFT was also summarized and proposed in this study.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009496507
http://hdl.handle.net/11536/38017
显示于类别:Thesis


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