Visible Emitting 2D Hybrid Tin Halide Perovskites for Use in Light-Emitting Devices
Luis Lanzetta a, Jose Manuel Marin-Beloqui a, Irene Sanchez-Molina a, Dong Ding a, Saif A. Haque a
a Imperial College London, United Kingdom, South Kensington, Londres, Reino Unido, United Kingdom
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SF2 Solution Processed Innovative Solar Cells
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Emilio Palomares and Garry Rumbles
Oral, Luis Lanzetta, presentation 021
Publication date: 20th June 2016

Organic lead halide perovskites have emerged as an outstanding class of materials for optoelectronic applications, with numerous examples in the fields of photovoltaics and light-emitting diodes. Nevertheless, the toxicity of lead is an issue of major concern that needs to be addressed for the commercialisation of this novel technology. The use of tin as a replacement for lead has been studied with promising results, although tin-based perovskites are significantly more sensitive to ambient conditions and exhibit unwanted metallic conductivity due to a self-doping issue.

Reduced-dimensionality perovskites have been recently introduced as a way of increasing material and device stability in lead-based materials. However, this approach has not been explored for device applications in hybrid tin halide perovskites. Interestingly, the metal-like behaviour of 3D systems (e.g. CH3NH3SnI3) can be suppressed by replacing methylammonium by larger organic cations (phenylethlyammonium, butylammonium) to induce the formation of 2D structures that present semiconducting properties1. This talk will cover the latest advances of our group in the field of low-dimensional hybrid tin halide perovskites. Specifically, the tunable optical properties of our materials, their photoluminescence characteristics and their capability to act as TiO2 sensitizers will be discussed. Finally, the incorporation of 2D tin-based perovskites into proof-of-principle light-emitting devices will be shown.

 

1            D. B. Mitzi, C. a. Feild, W. T. a. Harrison and  a. M. Guloy, Nature, 1994, 369, 467–469.

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