| 초록 |
Recently, a new class of organic semiconducting materials, conjugated polyelectrolytes has attracted interest for a variety of optoelectronic applications. Especially, water-soluble polyfluorene derivatives (WPFs) have been shown as interfacial layer in optoelectronics. Their ionic functionalities can effectively induce interface dipoles, resulting in tuning work function (W.F) of metal electrodes and provide solubility in polar solvents, resulting in fabrication of multilayer devices. Our previous WPFs have reversed polarity of original polymer solar cells (PSCs) and affected device performance (Voc, FF) in inverted PSCs. Based on these motivations, synthesized WPFs with various ionic groups were used as cathode interfacial layer in the ITO/WPFs/P3HT:PCBM/PEDOT:PSS/Ag solar cells. The electronic properties of WPFs for tuning W.F of ITO were characterized by UPS and other methods. Finally, we found that the performance was significantly influenced by the kind of ionic groups in WPFs. |
