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Interface Modification by Multifunctional Ammonium Salt toward High Performance and Stability Planar Perovskite Solar Cells

Abstract

Power conversion efficiency (PCE) of perovskite solar cells (PSCs) has realized 23.7%. However, defects and high moisture sensitivity in perovskite would limit further development of the device performance. Here, it is shown that the cetyl trimethyl ammonium bromide (CTABr), which is a multifunctional ammonium salt, plays dual roles in passivating the defects of perovskite and improving the moisture stability. Ammonium group in CTA+ cation could anchor on the surface of the MAPbI3 film to passivate the defects without the formation of secondary phase, Br- is uniformly distributed on the surface and vertical direction of the perovskite film. Finally, by optimizing the concentration of CTABr solution, a champion PCE of 20.28 % for the planar PSCs using FA0.95MA0.05Pb(I,Br)3 absorber and 18.95% for those using MAPbI3 absorber was achieved. Furthermore, the MAPbI3 device treated with CTABr exhibited better moisture resistance. Long-term stability was tested for 1600 h under dry condition in dark without obvious decline.

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Publication details

The article was received on 11 Mar 2019, accepted on 09 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02631B
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Interface Modification by Multifunctional Ammonium Salt toward High Performance and Stability Planar Perovskite Solar Cells

    S. Wang, Y. Zhu, C. Wang and R. Ma, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02631B

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