Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.068
Publication date: 11th July 2022
The modest stability of perovskite solar cells (PSCs) in ambient conditions represents a major impediment to their widespread commercialization. The interface between the hole-transport material (HTM) and perovskite is known to significantly affect the stability of PSCs.[1] Recently, the idea of combining the HTM function with the passivation of the perovskite surface via ad-hoc chemical interaction between the HTM and perovskite has been successfully exploited.[2] As a result, these HTMs anchored to the perovskite surface led to compact and ordered interfaces and to PSCs with a remarkable increase in both the efficiency and stability. In this talk, I will summarize key recent examples reported by us of low-cost HTM designs that can effectively interact with the surface of a triple cation (CsFAMA) perovskite promoting the interfacial charge transfer dynamics and the stability of PSCs. These examples include halogen-bonded[3], sulfonated[4], hydrogen-bonded, and fluorene-based HTM molecular designs.
Furthermore, I will highlight the doping engineering of traditional HTMs (e.g., Spiro-OMeTAD) as an additional valid strategy when aiming at competitive long-term stability. When the widely used hygroscopic dopants (e.g., LiFTSI) of Spiro-OMeTAD are replaced with a single molecular dopant, i.e., F4-TCNQ, a remarkable stability of mesoporous PSCs in air is achieved[5]. We demonstrate that the high uniformity of F4-TCNQ doping in Spiro-OMeTAD and reduced dopant aggregation and dopant migration towards the anode are the main reasons for the increased stability of PSCs in air, beyond the well-known hydrophobic protection of the perovskite induced by the F4-TCNQ dopant.
The financial support of Jane & Aatos Erkko Foundation (project: SOL-TECH) is gratefully acknowledged for funding. This work is part of the Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN), Decision No. 320165.
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