Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.259
Publication date: 18th December 2023
Tandem photovoltaic with complementary absorbing sub-cells is a promising pathway to overcome the thermalization loss and surpass the detailed balance limit of single junctions, stimulating intense interest. In recent years, the integration of wide-bandgap perovskite solar cells with narrow-bandgap organic solar cells represents a more prospective route in constructing tandem solar cells. However, for n-i-p type perovskite/organic tandems, the crucial interconnection layer (ICL) has been limited to the MoOx/metal nanoparticles/ZnO structure. As is well-known, this ICL has several limitations, leading to undesired optical and energy losses within the tandem's ICL, as well as high costs and time consumption from a fabrication perspective. In our study, we introduced a solution-processed hole transporting material to replace the traditional thermally evaporated MoOx in building the ICL for inorganic-perovskite/organic tandems. The optimized ICL exhibited significantly improved transmittance, particularly in the near-infrared region, which was conducive to enhancing the efficiency of the rear organic cell in harnessing light and achieved an increase in short-circuit current density (JSC) of approximately 1.5 mA/cm2. Additionally, owing to the favorable energy level alignment in the optimized ICL, the tandem device achieved a recorded open-circuit voltage of up to 2.3 V, along with an efficiency of 21% and enhanced stability.
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