| 초록 |
Organic solar cells (OSCs) based on low-cost polymers are attracting considerable interest in academic and industrial research for flexible light-weighted applications. Recently, power conversion efficiencies of OSCs have reached approximately 10%. However, their long-term stability is still a remaining issue, especially due to a hole extraction layer (HEL) of acidic poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS). To replace the PEDOT:PSS with a stable material, various metal oxides such as molybdenum oxide (MoO3), tungsten oxide (WOx), and vanadium oxide (V2O5), have been employed and showed the enhancement of the stability as well as the device performance. Here we present the performance and stability of OSC devices employing the V2O5. We demonstrate how the V2O5 layer helps maintain the device performance, whose origin was investigated thoroughly by electrochemical impedance spectroscopy (EIS). |
