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Angew Chem Int Ed Engl. 2019 May 7. doi: 10.1002/anie.201902959. [Epub ahead of print]

The Second Spacer Cation Assisted Growth of a 2D Perovskite Film with Oriented Large Grain for Highly Efficient and Stable Solar Cells.

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MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Department of Physics, The Chinese University of Hong Kong, New Territories, 999077, Hong Kong, P. R. China.


The fabrication of high-quality film with large grains oriented along the direction of film thickness is important for 2D Ruddlesden-Popper perovskite-based solar cells (PVSCs). High-quality 2D BA2 MAn-1 Pbn I3n+1 (BA+ =butylammonium, MA+ =methylammonium, n=5) perovskite films were fabricated with a grain size of over 1 μm and preferential orientation growth by introducing a second spacer cation (SSC+ ) into the precursor solution. Dynamic light scattering showed that SSC+ addition can induce aggregation in the precursor solution. The precursor aggregates are favorable for the formation of large crystal grains by inducing nucleation and decreasing the nucleation sites. Applying phenylethylammonium as SSC+ , the optimized inverted planar PVSCs presented a maximum PCE of 14.09 %, which is the highest value of the 2D BA2 MAn-1 Pbn I3n+1 (n=5) PVSCs. The unsealed device shows good moisture stability by maintaining around 90 % of its initially efficiency after 1000 h exposure to air (Hr=25±5 %).


2D perovskite solar cells; energy conversion; large grains; precursor aggregation; second spacer cation


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