122nd General Meeting of the KCS

Type Symposium
Area [Polymer Chemistry - Material Chemistry Divisions Joint Symposium] Organic/Inorganic/Polymer Hybrids Materials: Present and Future
Room No. Room 325C+D
Time FRI 09:40-:
Code POMA-3
Subject Tetraphenylimidazole and triphenylamine-based simple hole-transporting materials for efficient perovskite-solar cells
Authors Sanghyuk Park
Department of Chemistry, Kongju National University, Korea
Abstract In organic hole-transporting material(HTM)-based p-i-n planar perovskite solar cells (PSCs), which have simple and low-temperature processibility feasible to low-cost flexible PSCs, the incident light has to pass through the HTM before reaching the perovskite layer. Therefore, photo-excited state of organic HTM could become important during the solar cell operation, but this feature has never been considered for the HTM design until now. In this work, we prove that designing organic HTMs to have the enhanced property at their photo-excited states could be a new methodology to improve their performances for the high efficiency p-i-n PSCs. Especially, we focus on their transition dipole moment variation at the photo-excitation and firstly develop a design principle of organic HTMs, which can intensify this feature by the excited-state intramolecular proton transfer (ESIPT) process, for the high performance p-in planar PSCs. Following the design rules, different from the conventional HTMs such as spiro-OMeTAD and PTAA, organic HTMs can be designed to have high dipole moment at the excited states, and this property can be preserved during the solar cell operation due to their extended lifetime by the ESIPT process, consequently improving the charge recombination and extraction property of PSC devices. Moreover, their UV-filtering ability is beneficial to enhance the photostability of PSCs. We believe that our suggestion could be a new strategy to design efficient HTMs for high performance PSCs.
E-mail spark0920@kongju.ac.kr