Carrier cooling in Perovskite under Hydrostatic Pressure Probed by Transient Absorption Spectroscopy
Loreta Angela Muscarella a, Eline M. Hutter a, Jan Versluis a, Huib Bakker a, Bruno Ehrler a
a AMOLF Institute, Science Park, Amsterdam
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, Loreta Angela Muscarella, 005
Publication date: 11th February 2019

The rise of the efficiency of perovskite solar cells from 3.8% to 23.3% in less than 10 years has shaken up the scientific photovoltaic community. A comprehensive understanding of fundamental properties of these intriguing materials is paramount for further progress in device applications. In this work we investigate how the charge carrier cooling dynamics in MAPbI3 thin films is affected by hydrostatic pressure up to 400MPa. In particular, charge cooling is probed by pump-probe transient absorption spectroscopy in the range of 0.2-700ps. We find a dramatic increase of carrier temperature at the picosecond timescale when the pressure is increased. We also investigate the effect of pressure on cooling timescales, as recently the slow cooling in those material has sparkled significant interest. Furthermore, we present a first insight on how the cooling is influenced by the phase transition, which occurs at 325 MPa for this perovskite. Our findings will contribute to the understanding of ultrafast carrier dynamics of metal halide perovskites.

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