CH3NH3PbI3 hybrid halide perovskite : beyond photovoltaics
Vendredi 24 mars 2017 14:00
- Duree : 1 heure
Lieu : ILL 4, Amphi Chadwick - 71 avenue des Martyrs - Grenoble
Orateur : László FORRO (Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne)
Recently, it has been shown that CH3NH3PbI3 is very promising material in photovoltaic devices1 reaching light conversion efficiency (η) up to 22%2. A strong research activity has been focused on the chemistry of the material to establish the most important parameters which could further improve η and to collect photons from a broad energy window. The major trend in this field is in photovoltaic device engineering although the fundamental aspects of the material are not yet understood.
In my lab we have devoted considerable effort to grow high quality single crystals at different length scales, ranging from large bulk crystals (up to 100 mm3) through nanowires3,4 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, optical properties, spectral features by photoemission etc. Furthermore, we have discovered that with a suitable doping the material becomes ferromagnetic, which could be modulated by photoelectrons via the RKKY interaction5. A selected set of measurements will be reported in this presentation together with some device applications6, 7.
Acknowledgement : The work has been performed in collaboration with Endre Horvath, Massimo Spina, Balint Nafradi, Peter Szirmai, Alla Araktcheva, Andrea Pisoni, Jacim Jacimovic, Andrzej Sienkiewicz, Claudio Grimaldi, Hugo Dil, Henrik Ronnow and many others.
References :
1. Lee, M. M. et al.,Science 338, 643-647 (2012).
2. see reports of the Gaetzel and Hagfeldt groups
3. Horvath et al., Nano Letters 14, 6761, (2015)
4. Spina et al., (2016) Scientific Reports, 6, 1
5. Nafradi et al., Nature Communications, 7, 13406, (2016).
6. Spina et al., (2015) Small, 11, 4823 ; Spina et al., Nanoscale, 2016, 8, 4888
7. Nafradi et al., J. Phys. Chem. C 2015, 119, 25204
Contact : cuccari@ill.fr
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