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Issue 22, 2018
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Restrained light-soaking and reduced hysteresis in perovskite solar cells employing a helical perylene diimide interfacial layer

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Abstract

An n-type helical molecule perylene diimide (PDI2) has been explored as an efficient interfacial layer between TiO2 and perovskite for the preparation of perovskite solar cells. The extended π-conjugation of PDI2 ensures a high electron conductivity for efficient charge transport, and the oxygen atoms of the carbonyl groups can chelate with uncoordinated Pb2+ to passivate the surface defects of perovskite crystals. It thereby suppresses interfacial recombination, enhances efficiency, and reduces hysteresis and the light-soaking instability. The power conversion efficiency (PCE) of our perovskite solar cells showed negligible dependence on the thickness of the PDI2 interlayer, and the champion device achieved a high PCE of 19.84% and the hysteresis value (ΔPCE) was reduced to 2.34% compared to 6.46% in the perovskite device without the presence of the PDI2 interlayer.

Graphical abstract: Restrained light-soaking and reduced hysteresis in perovskite solar cells employing a helical perylene diimide interfacial layer

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Supplementary files

Article information


Submitted
20 Mar 2018
Accepted
15 May 2018
First published
16 May 2018

J. Mater. Chem. A, 2018,6, 10379-10387
Article type
Paper

Restrained light-soaking and reduced hysteresis in perovskite solar cells employing a helical perylene diimide interfacial layer

L. Yang, M. Wu, F. Cai, P. Wang, R. S. Gurney, D. Liu, J. Xia and T. Wang, J. Mater. Chem. A, 2018, 6, 10379
DOI: 10.1039/C8TA02584C

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