Unveiling Charge Carrier Transport in π-Conjugated Molecular Wire on Micro- and Macroscopic Scales

Abstract

Molecular wires of π-conjugated polymers and molecular assemblies are cutting-edge motifs for evolving flexible and cost-effective organic electronics. They consist of various morphologies in length scale from a single-molecule, multi-molecular aggregate to a bulk film; however, the conventional evaluation of charge carrier motility cannot clarify the complicated interplay of length-dependent charge-transport processes. Thus, bridging the gap between microscopic and macroscopic electronic natures has been the subject of intense debate within the scientific community. In this regard, time-resolved microwave conductivity (TRMC) offers a versatile approach to unveiling the local charge carrier mobility with minimized effects of extrinsic impurities and barriers at the interfaces. This dissertation seeks to review the recent evolution of TRMC such as extension of excitation light sources, frequency modulation together with comprehensive analysis of complex conductivity, and combination with field-inductive metal/insulator/semiconductor device. We believe that this account is exploratory and interpretative for understanding the charge carrier transport in π-conjugated molecular wires.