Organic photovoltaic cell fabricated by electrospray deposition using non-halogenated solvent

摘要

An electrospray deposition (ESD) is a solution process, which has several advantages, such as the utilization of low concentration solution, the large device area using a continuous roll-to-roll process, and the simple setup without vacuum condition. By applying a high voltage to a solution, mists are generated from a tip of glass capillary, leading to the formation of organic thin film. Halogenated solvents are often used, but the amount of solvent should be reduced from the environmental aspect. Thus, by using the ESD and the non-halogenated solvent, the manufacturing process is friendly to environment. In this research, by measuring current density-voltage (J-V) characteristics and atomic force microscope (AFM) images, we evaluated OPV characteristics and root mean square (RMS) roughness of devices fabricated using the non-halogenated solvent. By adding 1,8-diiodooctane (DIO), the photo conversion efficiency (PCE) was drastically improved, and the PCE of 5.45% was achieved.