| 초록 |
We need hole transport materials (HTMs) to achieve high power conversion efficiency in perovskite solar cells. Most HTMs require additives such as lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and tert-butylpyridine (tBP) to increase hole mobility. However, these dopants degrade the perovskite film, resulting in diminished the stability of the device. Therefore, HTMs with high hole mobility must be developed to solve this problem. We report a dopant-free polymeric HTM, RCP, which shows high hole mobility in the absence of dopants. The random copolymer (RCP) formed by combining benzodithiophene (BDT) and benzothiadiazole (BT) was expected to have favorable HOMO energy level (-5.41 eV). Resulting device exhibits high power conversion efficiency (17.3%) with long-term stability. it demonstrate remarkable stability, working for more than 2 months at 75% humidity. These results provide a broad strategy for developing efficient dopant-free HTMs. |
