The paper reviews recent advances in characterisation of charge carrier transport in organic semiconductor layers by time-of-flight photocurrent measurements, with the emphasis on the measurements of the samples with co-planar electrodes. These samples comprised an organic semiconductor layer whose thickness is on the order of a μm or less, and thus mimic the structures of organic thin film transistors. In the review we emphasise the importance of considering spatial variation of electric field in these, essentially two-dimensional structures, in interpretation of photocurrent transients. We review the experimental details of this type of measurements and give examples that demonstrate exceptional sensitivity of the method to minute concentration of electrically active defects in the organic semiconductors as well as the capability of probing charge transport along the channels of different mobility that reside in the same sample.

本文回顾了通过飞行时间光电流测量表征有机半导体层中载流子传输的最新进展，重点是利用共面电极对样品的测量。这些样品包括有机半导体层，该有机半导体层的厚度为μ的数量级。m或更小，因此模仿有机薄膜晶体管的结构。在这篇综述中，我们强调了在解释光电流瞬变中考虑这些二维结构中电场的空间变化的重要性。我们回顾了这种类型的测量的实验细节，并举例说明了该方法对有机半导体中电活性缺陷的微小集中的出色灵敏度，以及探测沿存在于半导体中的不同迁移率通道的电荷传输的能力。相同的样本。