Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Hybrid halide perovskites have drawn significant attention due to their outstanding photovoltaic capabilities. However, these materials exhibit poor environmental stability with respect to moisture, light, and temperature, which limits the long-term performance in solar cells. Here, we present the multi-technique approach that combines solid-state NMR spectroscopy, X-ray diffraction, and electron microscopy to gain atomic-level insight into the moisture-induced degradation pathways in methylammonium lead iodide (MAPbI3) and state-of-the-art triple cation mixed halide ((Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3 (CsMAFA)) perovskites. The influence of moisture (40% and 85% relative humidity) on these perovskites is examined using ex-situ ssNMR measurements. In particular, 1D 1H, 133Cs, and 2D 1H-1H correlation experiments allow the changes in the local structures of organic cations to be measured and distinguished in fresh and moisture aged materials. In situ X-ray diffraction, in operando liquid cell transmission electron microscopy and PL spectroscopy measurements and analyses further corroborates the structural and photophysical changes caused by the formation of by-products or phase segregation in the moisture aged materials. By comparison, defect passivated MAPbI3 by dilute concentrations of tertiary propylamine cation (TPA+, 4mol%) exhibits enhanced moisture stability.[1] This work highlights the importance of atomic-level understanding of chemical degradation pathways and the defect passivation routes to achieve stable and efficient hybrid perovskites for photovoltaic applications.[2]
References:
(1) Krishna, A.; Akhavan Kazemi, M. A.; Sliwa, M.; Reddy, G. N. M.; Delevoye, L.; Lafon, O.; Felten, A.; Do, M. T.; Gottis, S.; Sauvage, F. Defect Passivation via the Incorporation of Tetrapropylammonium Cation Leading to Stability Enhancement in Lead Halide Perovskite. Adv. Funct. Mater. 2020, 30, 1979737.
(2) Akhavan Kazemi, M. A.; Raval, P.; Cherednichekno, K.; Chotard, J.; Krishna, A.; Demortiere, A.; Reddy, G. N. M.; Sauvage, F. Molecular‐Level Insight into Correlation between Surface Defects and Stability of Methylammonium Lead Halide Perovskite Under Controlled Humidity. Small Methods 2020, 2000834.
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