Manaka Takaaki, Iwamoto Mitsumasa
Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Light Sci Appl. 2016 Mar 11;5(3):e16040. doi: 10.1038/lsa.2016.40. eCollection 2016 Mar.
We give a brief overview of the electric-field induced optical second-harmonic generation (EFISHG) technique that has been used to study the complex behaviors of organic-based devices. By analyzing EFISHG images of organic field-effect transistors, the in-plane two-dimensional distribution of the electric field in the channel can be evaluated. The susceptibility tensor of the organic semiconductor layer and the polarization of the incident light are considered to determine the electric field distribution. EFISHG imaging can effectively evaluate the distribution of the vectorial electric field in organic films by selecting a light polarization. With the time-resolved technique, measurement of the electric field originating from the injected carriers allows direct probing of the carrier motion under device operation, because the transient change of the electric field distribution reflects the carrier motion. Some applications of the EFISHG technique to organic electronic devices are reviewed.
我们简要概述了电场诱导光学二次谐波产生（EFISHG）技术，该技术已被用于研究有机基器件的复杂行为。通过分析有机场效应晶体管的EFISHG图像，可以评估沟道中电场的面内二维分布。考虑有机半导体层的极化率张量和入射光的偏振来确定电场分布。通过选择光偏振，EFISHG成像可以有效地评估有机薄膜中矢量电场的分布。利用时间分辨技术，对注入载流子产生的电场进行测量，可以直接探测器件工作状态下载流子的运动，因为电场分布的瞬态变化反映了载流子的运动。本文综述了EFISHG技术在有机电子器件中的一些应用。
