Tuning of Electrical Conductivity by Photoirradiation and Electric Fields

Abstract

Control of electrical conductivity by using external stimuli such as photoirradiation and electric fields is one of the major subjects in materials science because of prospects for the discovery of potential optoelectronic materials. Photoexcitation of crystalline materials can lead to the change of the electronic states and the excitation of vibrational motions via the nonradiative relaxation process from the electronically excited states. Thus, the change of phases and physical properties of crystalline materials is expected with photoirradiation. The application of electric fields is also known to be able to control carrier concentration and modify electronic states in materials. Moreover, the concurrent application of these external stimuli is expected to advance for unprecedented optoelectronic functions to be revealed due to synergy effects. As a target in the exploration of the control using external stimuli, the crystalline molecular charge-transfer complex which shows metallic conductivity, that ...