Triphenylamine 3,6-carbazole derivative as hole-transporting material for mixed cation perovskite solar cells
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A new hole transporting material based on 3,6-disubstituted carbazole (3,6Cz-TPA) was synthesized through a one-step approach and was used as hole-transporting material in perovskite solar cells. The HTM exhibits molecular glass behavior and a high glass transition temperature of 146 °C. A hole-mobility of 7.0 × 10−6 cm2 V−1 s−1 has been measured which is slightly lower than the mobility of spiro-OMeTAD (2.5 × 10−5 cm2 V−1 s−1). The HOMO energy level, similar to the HOMO of spiro-OMeTAD, is suitable to allow the hole injection from the perovskite. Solar cells based on organic–inorganic hybrid cation perovskite light absorber have been built. The optimization of the concentration of the HTM shows an optimal concentration around 30 mM. Finally, the perovskite cells based on 3,6Cz-TPA as HTM lead to a power conversion efficiency around 16%, similar to the most commonly used spiro-OMeTAD (17%).
KeywordsCarbazole Triphenylamine Hole transporting material Perovskite solar cells Mixed cation
This work was supported by the French ministry of Higher Education and Research. This work was also supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science, ICT and Future Planning (MSIP) of Korea under contracts no. NRF-2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System). The mobility measurements has been performed with the use of the Hybriden facility at CEA-Grenoble. The LANEF framework (ANR-10-LABX-51-01) is acknowledged for its support with mutualized infrastructure. Dr. B. Schmaltz acknowledges Prof. Dr. K. Müllen, Dr. H-J Räder and S. Türk from Max Planck Institute for Polymer Research (Mainz, Germany) for mass spectroscopy measurements.
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