1. Hole-Transporting Materials with a Two-Dimensionally Expanded π-System around an Azulene Core for Efficient Perovskite Solar Cells
- Author
-
Lawrence T. Scott, Hidetaka Nishimura, Akinori Saeki, Ai Shimazaki, Yasujiro Murata, Naoki Ishida, and Atsushi Wakamiya
- Subjects
Biphenyl ,Electron mobility ,Energy conversion efficiency ,General Chemistry ,Azulene ,Photochemistry ,Biochemistry ,Catalysis ,Core (optical fiber) ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,Key factors ,chemistry ,HOMO/LUMO ,Perovskite (structure) - Abstract
Two-dimensionally expanded π-systems, consisting of partially oxygen-bridged triarylamine skeletons that are connected to an azulene (1–3) or biphenyl core (4), were synthesized and characterized. When tetra-substituted azulene 1 was used as a hole-transporting material (HTM) in perovskite solar cells, the observed performance (power conversion efficiency = 16.5%) was found to be superior to that of the current HTM standard Spiro-OMeTAD. A comparison of the hole mobility, the ability to control the HOMO and LUMO levels, and the hole-collection efficiency at the perovskite/HTM interface in 1 with reference compounds (2–4 and Spiro-OMeTAD) led to the elucidation of key factors required for HTMs to act efficiently in perovskite solar cells.
- Published
- 2015