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- Title
Influence of Alkoxy Chain Length on the Properties of Two‐Dimensionally Expanded Azulene‐Core‐Based Hole‐Transporting Materials for Efficient Perovskite Solar Cells.
- Authors
Truong, Minh Anh; Lee, Jaehyun; Nakamura, Tomoya; Seo, Ji‐Youn; Jung, Mina; Ozaki, Masashi; Shimazaki, Ai; Shioya, Nobutaka; Hasegawa, Takeshi; Murata, Yasujiro; Zakeeruddin, Shaik Mohammed; Grätzel, Michael; Murdey, Richard; Wakamiya, Atsushi
- Abstract
A series of two‐dimensionally expanded azulene‐core‐based π systems have been synthesized with different alkyl chain lengths in the alkoxy moieties connected to the partially oxygen‐bridged triarylamine skeletons. The thermal, photophysical, and electronic properties of each compound were evaluated to determine the influence of the alkyl chain length on their effectiveness as hole‐transporting materials (HTMs) in perovskite solar cells (PSCs). All the synthesized molecules showed promising material properties, including high solubility, the formation of flat and amorphous films, and optimal alignment of energy levels with perovskites. In particular, the derivatives with methyl and n‐butyl in the side chains retained amorphous stability up to 233 and 159 °C, respectively. Such short alkoxy chains also resulted in improved electrical device properties. The PSC device fabricated with the HTM with n‐butyl side chains showed the best performance with a power conversion efficiency of 18.9 %, which compares favorably with that of spiro‐OMeTAD‐based PSCs (spiro‐OMeTAD=2,2′,7,7′‐tetrakis[N,N‐bis(p‐methoxyphenyl)amino]‐9,9′‐spirobifluorene).
- Subjects
SOLAR cells; PHOTOVOLTAIC cells; PEROVSKITE; DYE-sensitized solar cells; MECHANICAL properties of condensed matter; AMORPHOUS substances
- Publication
Chemistry - A European Journal, 2019, Vol 25, Issue 27, p6741
- ISSN
0947-6539
- Publication type
Academic Journal
- DOI
10.1002/chem.201806317