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Solvent-Assisted Surface Modification Using Metallocene-Based Molecules for High-Efficiency Perovskite/Silicon Tandem Solar Cells
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DOI：10.1002/aenm.202401039.png)
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Abstract
En 中文
The presence of a high density of defects at the perovskite/electron transport layer (ETL) interface results in significant nonradiative recombination losses, thus impeding the efficiency enhancement of perovskite/silicon tandem solar cells (TSCs). In this investigation, a metallocene-based molecule, cobalt (III) dichlorophene hexafluorophosphate (CcPF6), is employed for perovskite surface passivation. To maximize its efficacy, the molecule is dissolved in a mixed solvent of acetonitrile and chlorobenzene, leading to the reconstruction of the perovskite surface and effective passivation of surface defects. This modification strategy substantially enhances the overall efficiency of perovskite/silicon tandem solar cells by mitigating the issue of low fill factor resulting from non-uniform coating of the top perovskite layer on the textured silicon bottom cell. Leveraging a double-sided textured silicon heterojunction (HJT) bottom cell, a certified power conversion efficiency (PCE) of 30.43% for a monolithic perovskite/silicon TSC (1.00 cm2) is achieved, featuring an open-circuit voltage (Voc) of 1.93 V and a fill factor (FF) of 78.43%. After storage in the drying cabinet (5% humidity at 20 degrees C) for 1000 h, the device retains 94.27% of its initial performance. An approach is proposed to modify perovskite surface utilizing mixed solvents and metallocene materials. The mixed solvent efficiently exposes trap defects on the perovskite surface, while the high electronegativity metallocene material effectively passivates these defects, significantly enhancing carrier transport efficiency. A certified PCE exceeding 30% is obtain on perovskite/silicon tandem solar cells. image
Keywords:
metallocene
perovskite/silicon tandem solar cells
silicon heterojunction
solvent-assisted surface modification strategy
Journal
IF:
26
Papers:
1.0W
Citations:
15.7W
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