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Robust Interfaces via Synergistic Cation-Anion Manipulation for Highly Efficient and Stable Inverted Perovskite Solar Cells
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DOI：10.1039/D5EE04111B.png)
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Abstract
En 中文
Ionic defect sites at planar photovoltaic interfaces cause usually the degradation of perovskite solar cells (PSCs); where uncoordinated ions and consequent instable counterions are the intrinsic reasons behind the interfacial instability. Present work proposes and experimentally verifies that; an interfacial modifier with the ability of simultaneously anchoring both cation & anion defect sites; could passivate uncoordinated ionic defect sites and synchronously immobilize the adjacent counterions. Exemplified by the molecule of 4; 5-dicyanoimidazole (DCI); the modified PSCs with DCI demonstrate efficaciously suppressed ion migration; prohibited phase segregation; as well as obvious transition from tensile stress to compressed in perovskite layer; which resulted in the optimized PSCs with remarkable champion PCE of 26.10% (certified 25.53%). Meanwhile; the unencapsulated device maintained over 95% of its initial efficiency after 1; 600 h at maximum power point tracking; along with nearly no degradation after 12 cycles of 12-h light and 12-h dark tests; as well as 98.2% retaining of its initial PCE over 2; 000 h in nitrogen atmosphere at 85 ℃.
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