Fabrication of bulk heterojunction solar cells by a modified spray-mist coating method

Abstract

The modified spray-mist coating method, which can fabricate thin films for organic photovoltaics (OPVs) by using ultrasonic deposition technique, is applied. This new method has a distinguishable merit, which enable us to roll-to-roll and pattern targeted aperture area. However, the modified spray-mist coated layer also has morphology with defects such as loosely linked droplets and pin-holes, like spray coating. Herein, we examined the basic characteristics of the modified spray-mist coating method as fine channel mist spray deposition and improved a method to maximize the OPV performance by thermal and additional solvent annealing.