| 초록 |
Perovskite Solar cells (PSCs) have been widely researched, and their power conversion efficiency (PCE) has been increased up to 22% in the recent years. Currently, most of the high efficiency PSCs utilize 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as a hole transport material (HTM), processed with the addition of dopants to increase mobility. However, lithium-containing dopant attracts water molecules owing to its hygroscopic nature, causing accelerated degradation. Also, the synthesis cost of spiro-OMeTAD is quite expensive due to the complex reaction steps. Thus, developing new HTM is highly essential. In this study, we synthesized indoloindole (IDID) derivatives as an HTM for PSCs. The HOMO levels of IDID derivatives are more stabilized than spiro-OMeTAD, giving higher open circuit voltage. The device using IDID based HTM showed comparable PCE with that of the device using spiro-OMeTAD. Notably, the device showed much higher stability. |
