Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Perovskite-based solar cells (PSCs) have rapidly become the hottest topic in photovoltaics due to their unique optical and electrical properties. The best performing device configuration of PSC is composed of an electron-transporting material, typically a mesoporous layer of TiO2, which is infiltrated with perovskite crystals and coated with a hole-transporting material (HTM). Currently, several research groups are making great efforts to optimize new HTMs for perovskite devices as an alternatives to the 2,2’,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD), and polytriarylamine (PTAA), which are the mostly used and the best performing HTMs for PSCs. However, they are relatively expensive and have been demonstrated limiting the long-term stability of the device. Therefore, four symmetrical star-shaped HTMs comprising planar triazatruxene core and electron-rich methoxy-engineered side arms have been synthesized and successfully employed in inorganic-organic hybrid lead halide perovskite solar cells. These HTMs are obtained from relatively cheap starting materials by facile preparation procedure, without the use of expensive and complicated purification techniques. Developed compounds have suitable highest occupied molecular orbitals (HOMO) with respect to the valence band level of the perovskite. Power conversion efficiency over 15% was achieved using 5,10,15-trihexyl-3,8,13-tris(4-methoxyphenyl)-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazole (KR131). This result demonstrates triazatruxene-based compounds as a new class of HTM for highly efficient perovskite solar cells.
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