| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Polymer Additive for High-performance Flexible Perovskite Solar Cells on Ag-mesh Transparent Electrodes |
| LI Zerong1,2, MAO Chenyu2, SUN Tao2, LIN Huang2,3, WANG Jiaming2, CHEN Buchao2, TANG Shiwei1, WANG Weiyan2,3,*
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1 School of Physical Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, China
2 School of Materials Science and Engineering, NingboTech University, Ningbo 315100, Zhejiang, China
3 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China |
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Abstract Flexible perovskite solar cells (PSCs) based on Ag-mesh transparent electrodes have been developed as promising power sources for portable and wearable electronic devices. However, the undesired interdiffusion of halogen and metal ions poses a challenge to the efficiency and stability of the devices. This study focuses on the preparation of flexible PSCs utilizing the combined effects of polyurethane (PU) polymer additive for grain boundary passivation and an interfacial protective layer. One advantage of the strong interaction between Pb2+ and the C=O species is that it improved the crystal structure of the perovskite films, resulting in films of reduced defect density. As a result, the Ag-mesh electrode’s flexible PSC demonstrated an enhanced power conversion efficiency (PCE) of 20.21%, ranking among the greatest PSC efficiencies on non-ITO electrodes to date. Moreover, the flexible PSCs demonstrated improved moisture and operational stability due to the presence of PU additive at the grain boundary and the interlayer barrier. This hindered the interdiffusion of halogen and metal. As a result, the PSCs were able to maintain 92.1% of their starting PCE value after being exposed to 30% relative humidity for 150 h, and 95% of their initial PCE when operating at the maximum power point for 1 000 h. Finally, after 1 000 cycles of bending with a 4 mm radius, the PSCs showed good mechanical stability, while also maintaining 86% of their initial PCE. This work can shed light on a new perspective for designing high-performance flexible perovskite-based optoelectronic devices.
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Published: 25 February 2025
Online: 2025-02-18
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2025, Vol. 39 
