Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.157
Publication date: 6th July 2018
Perovskite solar cells have been extensively developed for few years but still the ultrafast and fast processes occurring in this system are not fully understood. The main tools providing wide view of a charge transport behavior are transient absorption and time-resolved emission spectroscopies. In the femtoseconds to nanoseconds time range two main transient absorption features dominate. The first is the long-wavelength band edge bleach assigned to a state filling and decaying in nanosecond range [1]. The second one is caused by cooling of charges, it takes place in hundreds of femtoseconds and usually has a shape of a band edge bleach first derivative [2].
Comparison of transient absorption signals for differently sensitized methylammonium lead iodide (MAPbI3) solar cells (non-stoichiometric and stoichiometric ratio of PbI2:MAI in precursor solution) will be presented. It was found that modification of the precursor ratio from non-stoichiometric to stoichiometric leads to the drastic changes of transient absorption signal from the typical strong long-wavelength band-edge bleach to the weak derivative-like signal due to the bandgap shift [3].
Transient absorption and emission measurements allows determination of charge injection kinetics for different charge transporting materials and recombination rates within perovskite [2]. Our studies of the hole injection from MAPbI3 to spiro-OMeTAD and its xanthene derivative X60 [4] as well as the recent results of electron injection from MAPbI3 to PCBM, PenPTC and SPPO13 will be presented. Moreover, proper determination of the first and the second order recombination rate constants in perovskite materials will be proposed. In particular, the influence of different transient absorption data treatment (band integral, global analysis based on singular value decomposition and bleach minimum amplitude) on the obtained rate constants will be shown.
Acknowledgements
The study was supported by Polish Ministry of Science and Higher Education under project 0019/DIA/2017/46.
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[2] K. Pydzińska, J. Karolczak, I. Kosta, R. Tena-Zaera, A. Todinova, J. Idigoras, J.A. Anta, M. Ziółek, ChemSusChem, 2016, 9, 1547-1659.
[3] K. Pydzińska, J. Karolczak, M. Szafrański, M. Ziółek, RCS Advances, 2018, 8, 6479-6487.
[4] K. Pydzińska, P. Florczak, G. Nowaczyk, M. Ziółek, Synthetic Metals, 2017, 232, 181-187.
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