부산대학교 도서관

We present spontaneous surface flattening that can readily be achieved via alternative layer-by-layer deposition of cationic linear polyethylenimine and anionic poly(acrylic acid). This pair of polyelectrolyte is known to exhibit intriguing physical properties of interdiffusion and highly enhanced polymeric mobility even in the ionically complexed structures. a use of these inherent characteristics, we successfully demonstrated a spontaneous planarization of nano-patterned surfaces by depositing a very thin film of polyelectrolyte multilayers. In addition, we confirmed that the surface flattening effects strongly depends on the type of polyelectrolyte pairs. For instance, uses of non-interdiffusional polyelectrolytes or strongly charged polyelectrolytes rarely achieve the purpose of surface flattening. Finally, the applicability of surface flattening for dye sensitized solar cells has been investigated, where the efficiency of solar cells can be improved by the enhanced light transmittance of surface flattened ITO electrodes and the blocking layer effect for the electrolyte (iodine).