Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Methylammonium lead halide perovskite-based solar cells eventually exceeding revolutionary power conversion efficiencies of 20% [1] show radical change in solar energy research. Despite rapid progress in the device efficiencies, understanding of the factors contributing to such a high photovoltaic (PV) performance is still insufficient and therefore further development of perovskite solar cell technology inevitably requires deeper fundamental knowledge of device operation especially at initial steps after photoexcitation.Here, we aim to elucidate the nature and dynamics of photogenerated charge carriers in methylammonium lead iodide perovskites by employing time-resolved photoluminescence spectroscopy with up to several picoseconds time resolution. We show that PL dynamics features two distinct decay components: the fast one, with decay rate on the order of several to tens of psand the slow one decaying on the nanosecond time-scale. The two componential PL relaxation was observed for many different sample architectures, which shows that this behavior is an universal property of MAPbI3 perovskites. Measurements performed by varying photoexcitation densities over four orders of magnitude, enabled separation of photoluminescence components related to recombination of geminate and non-geminate charge-pairs. PL decay kinetics of the geminate recombination weakly depends on temperature and is remarkably independent of the material properties. The non-geminate recombination causes photoluminescence decay on a nanosecond time scale and is determined by charge extraction [2] and by recombination rate at very high intensities.
Acknowledgement: M.F. and V.G. thanks the financial support from the Research Council of Lithuania (a grant No. MIP-085/2015).
References:
[1] Bi, D. et al. Efficient luminescent solar cells based on tailored mixed-cation perovskites, Sci. Adv. 2, e1501170 (2016).
[2] Xing, G. et al. Long-range balanced electron and hole-transport lengths in organic-inorganic CH3NH3PbI3. Science 342, 344-347 (2013).
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