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Effect of annealing treatment and ICL in the improvement of OSC properties based on MEH-PPV:PC70BM and P3HT:PC70BM sub-cells

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Abstract

Tandem organic solar cells (OSCs), consisting of more than one (usually two) sub-cells, stacked and connected by a charge recombination layer (i.e., interconnecting layer (ICL)), are highly promising to boost OSC efficiency. The ICL plays a critical role in regulating the performance of tandem device. Here, we report ZnO or C60 as a simple ICL, modified then, by a PEDOT:PSS layer, can act as an efficient ICLs in tandem device to achieve a significant increase in performance compared to single sub-cell. After optimized optical properties of MEH-PPV:PC70BM and P3HT:PC70BM sub-cells by varying the annealing temperature, these ICLs are used to connect photoactive layers. For all tandem devices, we showed an improvement in optical properties, especially in the ground and excited states compared to optimized single sub-cells. The degree of improved performance in tandem devices is attributed to the connection which provides each ICL. For fully optimized tandem, based on C60 ICL, reached ~78% enhancement in charge transfer compared to the bottom sub-cell and 82% compared to the top sub-cell, obtained for λemission = 650 nm.

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Correspondence to Hamza Saidi.

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Bouzid, H., Saidi, H., Chehata, N. et al. Effect of annealing treatment and ICL in the improvement of OSC properties based on MEH-PPV:PC70BM and P3HT:PC70BM sub-cells. Bull Mater Sci 44, 240 (2021). https://doi.org/10.1007/s12034-021-02525-z

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  • DOI: https://doi.org/10.1007/s12034-021-02525-z

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