Annibale Paolo, Albonetti Cristiano, Stoliar Pablo, Biscarini Fabio
CNR Institute for the Study of Nanostructured Materials, Via Gobetti 101, I-40129 Bologna, Italy.
J Phys Chem A. 2007 Dec 13;111(49):12854-8. doi: 10.1021/jp709590p.
We investigate by a scanning probe technique termed phase-electrostatic force microscopy the local electrostatic potential and its correlation to the morphology of the organic semiconductor layer in operating ultra-thin film pentacene field effect transistors. This technique yields a lateral resolution of about 60 nm, allowing us to visualize that the voltage drop across the transistor channel is step-wise. Spatially localized voltage drops, adding up to about 75% of the potential difference between source and drain, are clearly correlated to the morphological domain boundaries in the pentacene film. This strongly supports and gives a direct evidence that in pentacene ultra-thin film transistors charge transport inside the channel is ultimately governed by domain boundaries.
我们通过一种称为相-静电力显微镜的扫描探针技术,研究了工作中的超薄并五苯场效应晶体管中有机半导体层的局部静电势及其与形态的相关性。该技术产生的横向分辨率约为60纳米,使我们能够观察到晶体管沟道上的电压降是阶梯式的。空间局部化的电压降,总计约占源极和漏极之间电势差的75%,与并五苯薄膜中的形态学畴界明显相关。这有力地支持并直接证明了在并五苯超薄薄膜晶体管中,沟道内的电荷传输最终受畴界控制。