Approaches for Performance Improvement of Low-Dimensional Perovskite Systems as Photovoltaic Materials
Allan Starkholm a b, Per H Svensson a b, Lars Kloo b
a RISE Surface, Process and Formulation, Forskargatan 20J, 15136 Södertälje, Sweden
b Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Allan Starkholm, 147
Publication date: 11th February 2019

Low-dimensional perovskites offer more opportunities for compositional exploration as compared to the limited 3D counterparts. The reduced connectivity in low-dimensional perovskites, however, has negative impact on the charge transfer between the inorganic sheets. This reduced dimensionality also results in increased band gaps and reduced conductivity between the semiconducting inorganic units. To address these issues, we have considered approaches to link the sheets by e.g. polyiodides. Polyiodides is an extensive class of compounds known for rich structural diversity and high conductivity where charge transport is conducted through the Grotthuss mechanism. The crystal structures of some of the investigated systems reveal the presence of polyiodide units acting as linkers between the inorganic anion slabs.[1] One of the compounds contain triiodide anions, I3, uniquely coordinated into the coordination sphere of two different lead atoms in two different sheets, thereby connecting the 2D inorganic slabs to form a 3D network.[1] Optical spectroscopy indicates low band gaps and the optoelectronic properties were further examined with band structure calculations. Additional investigations of different systems involving ionic liquids have been made to explore structural possibilities and to find methods of making thin films of such compounds. We have also explored and synthesized new lead-based organic–inorganic hybrid perovskite systems with functionalized species incorporated. Furthermore, robotized screening is applied in the quest for new photovoltaic materials incorporating functional units acting as linkers that results in improved properties.

This work was supported by the Swedish Foundation for Strategic Research (SSF) with Grant FID15-0023, ÅForsk foundation under Grant 17-594, and The Swedish Research Council.

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