Suppressed decomposition of organometal halide perovskites by impermeable electron-extraction layers in inverted solar cells

K.O. Brinkmann, J. Zhao, N. Pourdavoud, T. Becker, T. Hu, S. Olthof, K. Meerholz, L. Hoffmann, T. Gahlmann, R. Heiderhoff, M. F. Oszajca, N. A. Luechinger, D. Rogalla, Y. Chen, B. Cheng and T Riedl ()
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K.O. Brinkmann: Institute of Electronic Devices, University of Wuppertal
J. Zhao: Institute of Electronic Devices, University of Wuppertal
N. Pourdavoud: Institute of Electronic Devices, University of Wuppertal
T. Becker: Institute of Electronic Devices, University of Wuppertal
T. Hu: Institute of Electronic Devices, University of Wuppertal
S. Olthof: University of Cologne
K. Meerholz: University of Cologne
L. Hoffmann: Institute of Electronic Devices, University of Wuppertal
T. Gahlmann: Institute of Electronic Devices, University of Wuppertal
R. Heiderhoff: Institute of Electronic Devices, University of Wuppertal
M. F. Oszajca: Nanograde AG
N. A. Luechinger: Nanograde AG
D. Rogalla: Ruhr-Universität Bochum, RUBION, Universitätsstr. 150
Y. Chen: College of Chemistry/Institute of Polymers, Nanchang University
B. Cheng: College of Materials Science and Engineering, Nanchang University
T Riedl: Institute of Electronic Devices, University of Wuppertal

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract The area of thin-film photovoltaics has been overwhelmed by organometal halide perovskites. Unfortunately, serious stability concerns arise with perovskite solar cells. For example, methyl-ammonium lead iodide is known to decompose in the presence of water and, more severely, even under inert conditions at elevated temperatures. Here, we demonstrate inverted perovskite solar cells, in which the decomposition of the perovskite is significantly mitigated even at elevated temperatures. Specifically, we introduce a bilayered electron-extraction interlayer consisting of aluminium-doped zinc oxide and tin oxide. We evidence tin oxide grown by atomic layer deposition does form an outstandingly dense gas permeation barrier that effectively hinders the ingress of moisture towards the perovskite and—more importantly—it prevents the egress of decomposition products of the perovskite. Thereby, the overall decomposition of the perovskite is significantly suppressed, leading to an outstanding device stability.

Date: 2017
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DOI: 10.1038/ncomms13938

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