Mr. Paul-Henry Denis Profile

Paul-Henry Denis

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Proceedings Article | 30 May 2022 Presentation

Large organic functional cations as building blocks in low-dimensional hybrid perovskites: new semiconductors for optoelectronics

Dirk Vanderzande, Wouter Van Gompel, Paul-Henry Denis, Martijn Mertens, Arthur Maufort, Laurence Lutsen

Proceedings Volume PC12149, PC121490K (2022) https://doi.org/10.1117/12.2623020

KEYWORDS: Perovskite, Semiconductors, Optoelectronics, Solar cells, Organic semiconductors, Molecules, Thin film solar cells, Spectroscopy, Lead, Ions

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Hybrid Organic Inorganic Perovskites (HOIPs) have attracted a lot of attention since in 2009 a thin-film solar cell was produced with a PCE of almost 4%. Since then record after record in PCEs of perovskite solar cells using so-called 3D hybrid perovskites has been broken, reaching nowadays a PCE of more than 25%. The main drawback relates to the limited stability of performances by defects and/or ion mobility in the inorganic lattice. In an effort to improve stability and reduce hysteresis of the solar cells quasi 2D hybrid perovskites have been explored, quite often using besides methylammonium cations larger cations, e.g. butylammonium or more often phenylethylammonium cations. In recent years our research group is exploring the use of more complex and potentially functional larger cations composed of pyrene or carbazole subunits. We could demonstrate a substantial improvement of the thermal stability and under high relative humidity (77%) of active layers for perovskite solar cells composed of such quasi 2D hybrid perovskites. In this contribution, we discuss the basic mechanism of this stability effect. Furthermore, we present some recent results obtained using oligothiophene and a benzothieno[3,2-b]benzothiophene (BTBT) alkylammonium cation into the organic layer of a 2D layered lead iodide perovskite. Structural characterization, phase stability, and photoconductivity measurements of (n=1) and quasi 2D perovskites will be presented. Extraordinary high stability was observed for such layers under thermal stress (>240°C) and under high moisture conditions. Potential mechanisms and implications for alternative structures will be discussed.

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