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Issue 45, 2018
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High-efficiency organic solar cells based on a halide salt and polyfluorene polymer with a high alignment-level of the cathode selective contact

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Abstract

Advances in organic photovoltaic technology for improving the power conversion efficiency (PCE) towards the theoretical maximum require efficient light-absorbing polymers, a high alignment-level of selective contacts, and an easy manufacturing process with low cost to reach them. The halide salts constitute a highly promising class of materials that can produce better selective contacts in solar cells for improving the PCE. In this article, we demonstrate and report the use of a haloid salt in organic solar cells utilized as an interlayer. The haloid salt is deposited on top or below of polyfluorene polymer (PFN) layer and after it is placed on a transparent conductive oxide (TCO). Thermal evaporation of LiF layers is carried out to deposit ultrathin films of 0.5 nm to 0.8 nm thickness. As a photoactive layer we use the low-bandgap PBDTTT-EFT:PC70BM bulk-heterojunction. Among the different architectures analyzed we obtained a PCE of 11.00%, with an outstanding fill factor of FF = 73.5%, which is among the best reported for solar cells. This new stacking of a halide salt with polyfluorene materials could find use in fully exploiting the potential of various halide systems, and also opens up new opportunities to improve OSCs with a view to achieving record efficiencies.

Graphical abstract: High-efficiency organic solar cells based on a halide salt and polyfluorene polymer with a high alignment-level of the cathode selective contact

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Publication details

The article was received on 17 Jun 2018, accepted on 29 Aug 2018 and first published on 18 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA05778H
Citation: J. Mater. Chem. A, 2018,6, 22534-22544
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    High-efficiency organic solar cells based on a halide salt and polyfluorene polymer with a high alignment-level of the cathode selective contact

    V. S. Balderrama, J. G. Sánchez, G. Lastra, W. Cambarau, S. Arias, J. Pallarès, E. Palomares, M. Estrada and L. F. Marsal, J. Mater. Chem. A, 2018, 6, 22534
    DOI: 10.1039/C8TA05778H

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