Publication date: 15th December 2025
The current design of high performing metal halide perovskite solar cells consists of multilayer device architecture with glass / transparent conducting oxide (TCO) / electron or hole-transport layer [E(H)TL] / perovskite / H(E)TL / electrode. This stacked configuration leads to efficient charge extraction but also introduces physico-chemical interactions at the buried interfaces that strongly influence device operational stability through a myriad of degradation pathways. In n-i-p architecture, 2,2’,7,7’-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9’-spirobifluorene (spiro-OMeTAD) is still widely employed as HTL. A thorough characterization of the physico-chemical dynamical processes taking place in HTLs is important to further design strategies aiming robust devices. In this talk, we provide our understanding of physico-chemical processes taking place in spiro-OMeTAD including ion migration, redox reactions, dopant instability, and interfacial energy level alignments.1-3 The p-i-n architecture has also gained increasing attention due to its improved performance. In this inverted structure, the HTL (or hole-selective contact) is implemented using self-assembled monolayer (SAM) strategy. Recent advances in SAMs highlight the importance of molecular design principles including dipole engineering and anchoring/terminal groups. In the second part, this talk emphasizes the roles that HTLs play in p-i-n architectures, considering charge-transport, interfacial chemistry, and operational stability.4,5
The funding supports from the Okinawa Institute of Science and Technology Graduate University, the OIST Proof of Concept (POC) Program, the OIST R&D Cluster Research Program, and JSPS KAKENHI Grants are acknowledged. The presenter acknowledges the continuous strong supports from Prof. Yabing Qi and Prof. Ryota Kabe.
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