| 초록 |
In this study, we propose an ultrafast and scalable technique to ensure the deposition of high quality organic films on a liquid substrate by utilizing spontaneous spreading phenomenon. Our novel approach shows excellent air processability because the ultrafast process prevents adsorption of oxygen effectively. This process has reliable control of the thickness of polymer films within tens of nanometer, and the polymer films can be easily transferred on various substrates. Furthermore, nanomorphology including crystallization, chain alignment, and phase separation in polymer films can be efficiently managed in a very short time by controlling spreading conditions and removal of solvent. Experimentally, with BHJ films having efficiently optimized nanomorphology formed on the liquid substrate, we successfully fabricated polymer solar cells with a high power conversion efficiency of 8.44%. |
