Apparent dependence of conductivity of a conducting polymer on an electric field in a field effect transistor configuration

作者：Jin Lu, Nicholas J. Pinto, Alan Graham MacDiarmid · 发表于：Journal of Applied Physics · 年份：2002 · DOI：10.1063/1.1511291 · 被引用次数：75 · 研究领域：Conducting polymers and applications、Organic Electronics and Photovoltaics、Advanced Sensor and Energy Harvesting Materials

A curious effect is reported whereby an electric field apparently greatly affects the conductivity of an organic polymer, poly-3,4-ethylenedioxythiophene (PEDOT), doped to the “metallic” conducting regime when it is used in an all-organic polymer field effect transistor configuration. The response time for change in current in the source/drain PEDOT polymer with a change of gate voltage is slow (⩽∼2 s), suggesting that ionic diffusion is involved in the phenomenon. It is suggested that the electric field changes only the conductivity of the lowly conducting polymer matrix, which contains highly conducting islands of PEDOT, thus changing the extent of percolation of electric charge between metallic islands, and thereby affecting the bulk conductivity of the PEDOT source/drain material.