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Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage
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Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage
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Journal Article
Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage
2023
Overview
Perovskite solar cells (PSCs) are multilayer structures. The interface between electron transport layer and perovskite is the mechanical weakest point in flexible PSCs due to its low fracture energy. Herein, we develop a highly adhesive polyamide-amine-based hyperbranched polymers to reinforce the interface. The interface fracture energy is improved from 1.08 to 2.13 J·m
−2
by the hyperbranched polymers with adhesive groups and dynamic hydrogen bond networks. The polymer functionalized perovskite solar cells achieve superior power conversion efficiencies of 25.05% and 23.86% for rigid and flexible devices, respectively. Furthermore, the hyperbranched polymer contains abundant intramolecular cavities that can capture Pb
2+
. Pb leakage after solar cell damage is effectively suppressed. Our findings provide insights on designing adhesive interface layers towards high-efficiency, mechanical-stable and environment-friendly flexible perovskite solar cells.
The low adhesive fracture energy of electron transport layer/perovskite interface makes it prone to delamination under mechanical stress. Here, authors develop polyamide-amine-based hyperbranched polymer to provide strong adhesion, leading to device efficiency of over 25% for perovskite solar cells.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
