| 초록 |
Inserting a interfacial nanolayer between the photoactive layer and the Al negative electrode is one of the most effective ways to improve the power conversion efficiencies(PCEs) of organic photovoltaic cells (OPVs). We employed the solution-processed ultrathin polymeric layer of poly(4-vinylphenol) (PHS) , as an interfacial layer between photoactive layer and the Al cathode to enhance device performance in OPVs and investigated the roles of the interfacial nanolayer. The thin polymeric layer forms a dipole layer and causes the vacuum level of the adjacent negative electrode to shift upward, which resulted in increase of the built-in potential and facilitated carrier extraction. As a result, open-circuit voltage, short-circuit current, fill factor, and PCE of the device using a PHS nanolayer were improved. The solution-processed PHS layer can be an attractive alternative to conventional vacuum-deposited metal fluoride layers. |
