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Donia Fredj3 4 Sadok Ben Dkhil2 Olivier Margeat1 Christine Videlot-Ackerman1 Jorg Ackerman1 Mohamed Boujelbene3

3, Faculté des sciences de Sfax, Marseille, , France
4, Faculté des sciences de Sfax, Sfax, , Tunisia
2, Dracula Technologies, Valence, , France
1, Centre Interdisciplinaire de Nanoscience de Marseille, Marseille, , France

Organic-inorganic hybrid materials have been broadly investigated owing to their various properties used in optoelectronics and solar cell [1].
Here, we report synthesis of two new organic-inorganic hybrid materials which are obtained by slow evaporation at room temperature using the same organic cation for two different molar ratio. These two compounds are characterized by X-ray diffraction, infrared and Raman spectroscopy, optical absorption and photoluminescence measurements.
Additionally, we demonstrate that these compounds can be used in organic solar cells. In fact, the energy band gap of these materials was found to be closed to that used in interfacial layers [2] of some organic solar cells.
By optimizing optical, electrical, and morphological properties of these new wide bandgap materials, bulk heterojunction solar cells with conversion efficiency exceeding 9.5 % are obtained in normal device structures with all-solution-processed interlayers in normal device structure. More importantly, the morphology and especially the surface roughness of these hybrid layers is crucial to obtain hole blocking behavior leading to fill factor up to 72 %.

[1] Vitalii Yu. Kotov et al., New J. Chem., 2016, 40, 10041--10047
[2] Sadok Ben Dkhil et al., Adv. Energy Mater. 2014, 4, 1400805
[3] S. Ben Dkhil et al.. Towards high-temperature stability of PTB7-based bulk heterojunction solar cells: impact of fullerene size and solvent additive, Adv. Energ. Mater. 2016, 1601486
[4] S. Ben Dkhil et al. Square-Centimeter-Sized High-Efficiency Polymer Solar Cells: How the Processing Atmosphere and Film Quality Influence Performance at Large Scale, Adv. Energ. Mater. (2016), 1600290/1-10.

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