Flexible Perovskite/Silicon Tandem Solar Cells Exceeding 30% Efficiency at Scale.
basic_science · Level V
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- Record sourced from PubMed, PMID 42198892.
- Also identified by DOI 10.1002/adma.73479.
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Abstract
Flexible perovskite/silicon tandem solar cells (FTSCs) represent a frontier for high-power-density, conformable electronics, yet their commercial viability is hindered by the dual challenges of interfacial carrier recombination and mechanical delamination at the perovskite/C<sub>60</sub> interface. Here, we demonstrate a bimolecular piperazine-derived interface engineering strategy that simultaneously optimizes interfacial photophysics and structural integrity. By applying a synergistic combination of piperazine dihydrochloride (PDCl) and 1-(4-chlorophenyl) piperazine hydrochloride (p-ClPh-PCl), we achieve complementary field-effect passivation and in situ formation of a stabilizing low-dimensional template. While PDCl effectively suppresses interfacial trap states and modulates band alignment for accelerated electron extraction, the p-ClPh-PCl facilitates uniform C<sub>60</sub> growth, preventing fullerene aggregation and reinforcing interfacial adhesion. This unified molecular design enables us to reach a power conversion efficiency of 31.51% (1 cm<sup>2</sup>) and a 30.31% for large-area (17.64 cm<sup>2</sup>) FTSCs, surpassing 30% PCE for the first time in FTSCs exceeding 10 cm<sup>2</sup> in device area. Furthermore, these devices exhibit exceptional durability, retaining 95% of their initial efficiency after 20,000 bending cycles and 650 h of continuous illumination.