1. Fluorinated Pentafulvalene-Fused Hole-Transporting Material Enhances the Performance of Perovskite Solar Cells with Efficiency Exceeding 23%.
- Author
-
Lee, Kun-Mu, Huang, Yao-Shen, Chiu, Wei-Hao, Huang, Ying-Kai, Chen, Gao, Adugna, Gizachew Belay, Li, Sie-Rong, Lin, Fang-Ju, Lu, Shih-I., Hsieh, Hsiao-Chi, Liau, Kang-Ling, Huang, Chun-Cheng, Tai, Yian, Tao, Yu-Tai, and Lin, Yan-Duo
- Subjects
- *
SOLAR cell efficiency , *SOLAR cells , *HOLE mobility , *CONJUGATED polymers - Abstract
Organic small molecular materials with coplanar π-conjugated system as HTMs in perovskite solar cells (PSCs) have attracted considerable attention due to their high charge transport capability and thermal stability. Herein, three novel pentafulvalene-fused derivatives with or without fluorine atoms incorporated (YSH-oF and YSH-mF and YSH-H, respectively) are designed, synthesized, and applied as hole-transporting materials (HTMs) in PSCs fabrication. The fluorinated HTMs, YSH-oF and YSH-mF, exhibited higher hole mobility and better charge extraction at the perovskite/HTM interface than non-fluorinated one do, presumably due to the closer intermolecular π-π packing interactions. As a result, small-area (0.09 cm2) PSCs made with YSH-oF and YSH-mF achieved an impressive power conversion efficiency (PCE) of 23.59% and 22.76% respectively, with negligible hysteresis, in contrast with the 20.57% for the YSH-H-based devices. Furthermore, for large-area (1.00 cm2) devices, the PSCs employing YSH-oF exhibited a PCE of 21.92%. Moreover, excellent long-term device stability is demonstrated for PSCs with F-substituted HTMs (YSH-oF and YSH-mF), presumably due to the higher hydrophobicity. This study shows the great potential of fluorinated pentafulvalene-fused materials as low-cost HTM for efficient and stable PSCs. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF