| 초록 |
Despite the wide use of conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) as a hole transport material in organic electronics, its hygroscopic nature, which is detrimental to the photo-active layer, has limited the long-term stability and efficiency of perovskite solar cells (PSCs). In this study, polyaniline doped with camphorsulfonic acid (PANI-CSA) was used for hole transport layer (HTL) as a substitute for PEDOT:PSS. PANI-CSA was well-dispersed in the organic solvent without any additional dispersing agent like PSS, and thus could produce homogenous and highly conductive polymer thin film. When used as HTL in PSC, PANI-CSA effectively transported photo-generated holes from perovskite layer to electrode, and showed superior device efficiency of 15.42% to PEDOT:PSS (14.11%). Most notably, air-stability of the device was dramatically improved by using PANI-CSA in place of PEDOT:PSS due to the moisture resistance. |
