| 초록 |
Designing hole transport materials (HTMs) has emerged as one of the most important approaches to improve the efficiency and stability of perovskite solar cells. We assessed the promise of a conjugated polymer, TFB (Poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)]), and a non-hygroscopic p-type dopant F4-TCNQ(2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) as HTM. F4-TCNQ-doped TFB serve as an ideal alternative to conventional HTM toward high hole mobility and suitable energy band alignment with the active layer. The band alignment is proposed to facilitate efficient charge extraction from the perovskite to the electrode and to increase the short-circuit current, which resulted in an enhanced power conversion efficiency. The hydrophobic nature of HTM was shown to enhance the long-term stability. Our simple, novel strategy paves the way for a promising route for a wide range of highly efficient solar cells. |
