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Synergistic Effect of Excited State Property and Aggregation Characteristic of Organic Semiconductor on Efficient Hole-Transportation in Perovskite Device |
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| Authors: | Bonghyun Jo Hansol Park Eswaran Kamaraj Sewook Lee Bumho Jung Sivaraman Somasundaram Gyeong G Jeon Kyu-Tae Lee Namdoo Kim Jong H Kim Bong-Gi Kim Tae Kyu Ahn Sanghyuk Park Hui Joon Park |
| Affiliation: | 1. Department of Organic and Nano Engineering, Hanyang University, Seoul, 04763 Korea
Department of Energy Science, Sungkyunkwan University, Suwon, 16419 Korea;2. Department of Organic and Nano Engineering, Hanyang University, Seoul, 04763 Korea Human-Tech Convergence Program, Hanyang University, Seoul, 04763 Korea;3. Department of Chemistry, Kongju National University, Kongju, 32588 Korea;4. Department of Organic and Nano Engineering, Hanyang University, Seoul, 04763 Korea;5. Department of Molecular Science and Technology, Ajou University, Suwon, 16499 Korea;6. Department of Physics, Inha University, Incheon, 22212 Korea;7. Department of Organic and Nano System Engineering, Konkuk University, Seoul, 05029 Korea;8. Department of Energy Science, Sungkyunkwan University, Suwon, 16419 Korea |
| Abstract: | Intrinsic characteristics of organic semiconductor-based hole transport materials (HTMs) such as facile synthesizability, energy level tunability, and charge transport capability have been highlighted as crucial factors determining the performances of perovskite photovoltaic (PV) cells. However, their properties in the excited state have not been actively studied, although PVs are operated under solar illumination. Here, the characteristics of organic HTMs in their excited state such as transition dipole moment can be a decisive factor that can improve built-in potential of PVs, consequently enhancing their charge extraction property as well as reducing carrier recombination. Moreover, the aggregation property of organic semiconductors, which has been an essential factor for high-performance organic HTMs to improve their carrier transport property, can induce a synergistic effect with their excited state property for the high-efficiency perovskite PVs. Additionally, it is also confirmed that their optical bandgaps, manipulated to have their absorption in the UV region, are beneficial to block UV light that degrades the quality of perovskite, consequently improving the stability of perovskite PV in p–i–n configuration. As a proof-of-concept, a model system, composed of triarylamine and imidazole-based organic HTMs, is designed, and it is believed that this strategy paves a way toward high-performance and stable perovskite PV devices. |
| Keywords: | built-in potential excited state dipole moment molecular aggregation perovskite photovoltaic cell |
