| 초록 |
The development of organic–inorganic hybrid perovskite has led to the fabrication of solar cells with outstanding efficiency. In perovskite solar cells, a hole transport layer is important because it generally prevents perovskites from exposure to air. Therefore, it is necessary to investigate dopant-free and hydrophobic polymeric hole transport material (HTM). This study examines a highly efficient perovskite solar cell (PSC) that employs a dopant-free HTM. A polymeric HTM (PTEG) combined with tetraethylene glycol (TEG) group is synthesized and systematically characterized. The results indicate that the PSC employing PTEG exhibits an efficiency of 19.8% in the planar device without any dopants, which corresponds to the highest value reported to date. In addition, an efficiency of 18.6% in the mesoporous device is also reported. These excellent results can be attributed to the high highest occupied molecular orbital (HOMO) energy level and good contact between perovskite and PTEG. |
