| 초록 |
Perovskite hybrid solar cells have recently been the subject of extensive investigations. Mixed perovskites, such as CH3NH3PbI3-xClx, display a long electron diffusion length and a high light absorption profile. Here, We report a novel D–A type conducting polymeric HTM (TTB-TTQ) based on thiophene and benzothiadiazole as an alternative to spiro-MeOTAD. The resulting polymer was highly soluble in many organic solvents and exhibited excellent film formability. The addition of lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) salt and tert-butylpyridine (tBP) to TTB-TTQ resulted in a rough film surface with a fibril structure and improved charge transport. We demonstrated a perovskite solar cell with the highest power conversion efficiency yet achieved in such cells, 14.1 %, which is 22.6 % greater than that of a device employing a spiro-MeOTAD. To the best knowledge of author, this efficiency is highest value, using D-A type polymeric HTM. |
