Seminar

Speaker

Prof. László Forró (Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne)

Date

16:00 - 17:00, March 9, 2015 (Monday)

Venue

Room 309, Frontier Research Laboratory, RIKEN

Title

CH₃NH₃PbI₃ hybrid halide perovskite: beyond photovoltaics

Abstract

Recently, it has been shown by the Snaith^1,2 and Graetzel groups^3,4 that CH₃NH₃PbI₃, is very promising material in photovoltaic devices reaching light conversion efficiency (η) up to 20%. A strong research activity has been focused in the chemistry of the material to establish the most important parameters which could further improve η and to collect photons beyond the 1.5 eV band gap. The major trend in this field is in device engineering although the fundamental aspects of the material are not yet understood.
In my lab we have devoted considerable effort to the growth of high quality single crystals at different length scales, ranging from large bulk crystals (up to 100 mm³) through nanowires³ down to quantum dots of tens of nanometers of linear dimensions. The structural tunability of the material allows to study a broad range of physical phenomena including electrical and thermal transport, magnetism and optical properties which will be reported in this presentation.

Acknowledgement: The reported work has been performed in collaboration with Endre Horvath, Massimo Spina, Balint Nafradi, Alla Araktcheva, Andrea Pisoni, Jacim Jacimvic and the Van der Marel group.

References:
1. Lee, M. M. et al.,Science 338, 643-647 (2012).
2. Stranks, S. D. et al.. Science, 342, 341−344, (2013).
3. Horvath et al., Nano Letters DOI: 10.1021/nl5020684