Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)
Publication date: 17th October 2024
Organic-inorganic hybrid perovskite, with the ABX3 structure (A = methylammonium (MA+), formamidinium (FA+) or Cs+, B = Pb2+, Sn2+, X = halide anion), have attracted great attention due to their outstanding optical properties and solution-processable fabrication. The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 26%, showing high performance comparable to conventional silicon solar cells.1 Development of efficient charge-collecting materials is essential for high-performance PSCs. Recently, chemically adsorbed monolayers have attracted much attention due to their high efficiency and good stability.2[MOU1] While many excellent hole-collecting materials have been reported, electron-collecting materials have been limited to fullerene derivatives and perylene diimide derivatives.3
In this study, we designed and synthesized a dipodal viologen derivative with two alkylphosphonic acid anchoring groups introduced on two pyridine moieties at the nitrogen position as monolayer electron-collecting materials (Bis-PA). As comparative compounds, monopodal counterparts bearing a single alkylphosphonic acid group and an ethyl-substituted (Et-PA) and nonsubstituted (Mono-PA) pyridine moiety were also synthesized. Cationic π-conjugated molecules are expected to efficiently and selectively extract electrons. PSCs using Bis-PA as an electron-collecting monolayer showed a champion PCE of 17%, higher than those of the Et-PA- and Mono-PA-based devices. In this poster, we will discuss the molecular design, fundamental properties, and characterization of PSCs.
This work is partially supported by JST-Mirai (JPMJMI22E2), NEDO-GI (JPNP21016), and JSPS KAKENHI.
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