“…Organic semiconducting materials have attracted much attention as an active layer for organic light emitting diode (OLED), organic thin-film transistor (OTFT) and organic solar cell (OSC) because the organic electronic devices are expected to be flexible, light-weight, large area, and low cost devices [1][2][3][4]. To achieve these purposes, various solution processes such as spin-coating, ink-jet printing, slot die coating, and spray coating are considered to be advantageous over the vacuum process.…”