Abstract
With the increasing demand of high efficiency solar cells, all-perovskite tandem solar cells have spotlighted. However, power conversion efficiency (PCE) of all-perovskite tandem solar cells suffer from the charge carrier losses of Pb-Sn perovskite, which are induced from the Sn2+ oxidation. In this report, we introduce metallic Ni as a sustainable reducing agent for Pb-Sn mixed perovskites. Metallic Ni can effectively reduce the oxidized Sn4+ in the perovskite precursor solution by oxidizing itself, and the generated Ni2+ did not affect to the perovskite lattice. In addition, by utilizing a simple magnetic filtration system, metallic Ni can remain in the perovskite precursor solution while the precursor solution is using. We also confirmed the availability of recycle of the metallic Ni without any further processing. Single-junction Pb-Sn mixed perovskite solar cells used metallic Ni achieved 22.26% of PCE (aperture size of 0.094 cm2), and 90% of the initial PCE was maintained for 1250 hours. Consequently, all-perovskite tandem solar cells reached to 28.13% of PCE (aperture size of 0.094 cm2), by adopting the metallic Ni as a reducing agent.
Published Version
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