An Eco-Friendly Passivation Strategy of Resveratrol for Highly Efficient and Antioxidative Perovskite Solar Cells

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Small Pub Date : 2024-10-09 DOI:10.1002/smll.202406127

Xianhu Wu, Jieyu Bi, Guanglei Cui, Nian Liu, Gaojie Xia, Jilong Sun, Jiaxin Jiang, Ning Lu, Ping Li, Chunyi Zhao, Zewen Zuo, Min Gu

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Abstract

The stability of perovskite solar cells is closely related to the defects in perovskite crystals, and a large number of crystal defects are caused by the solution method. In this study, resveratrol (RES), a green natural antioxidant abundant in knotweed and grape leaves, is introduced into perovskite films to passivate the defect. RES achieves defect passivation by interacting with uncoordinated Pb²⁺ in perovskite films. The defect formation energy of V_Pb and Pb_I on the surface of perovskite thin films is increased by RES doping, as calculated by density functional theory. The results show that the quality of the perovskite film is significantly improved, and the energy level structure of the device is optimized, and the power conversion efficiency (PCE) of the device is increased from 21.62% to 23.44%. RES can hinder the degradation of perovskite structures by O₂⁻ free radicals, and the device retained 88% of its initial PCE after over 1000 h in pure oxygen environment. The device retains 91% of the initial PCE after >1000 h at 25 °C and 50 ± 5% relative humidity. This work provides an idea for the use of natural and environmentally friendly additives to improve the efficiency and stability of devices.

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白藜芦醇的生态友好型钝化策略，用于高效抗氧化的过氧化物太阳能电池

包晶石太阳能电池的稳定性与包晶石晶体的缺陷密切相关，而溶液法会造成大量晶体缺陷。在本研究中，将结缕草和葡萄叶中富含的一种绿色天然抗氧化剂白藜芦醇（RES）引入到过氧化物薄膜中以钝化缺陷。RES 通过与包晶薄膜中未配位的 Pb2+ 相互作用来实现缺陷钝化。根据密度泛函理论的计算，掺入 RES 后，包晶薄膜表面 VPb 和 PbI 的缺陷形成能增加。结果表明，该方法显著提高了透辉石薄膜的质量，优化了器件的能级结构，并将器件的功率转换效率（PCE）从 21.62% 提高到 23.44%。RES 可以阻止 O2- 自由基对包晶石结构的降解，该器件在纯氧环境中使用超过 1000 小时后，仍能保持 88% 的初始 PCE。在 25 °C、相对湿度为 50 ± 5%的环境中使用 1000 小时后，该装置仍能保持 91% 的初始 PCE。这项工作为使用天然环保添加剂提高设备的效率和稳定性提供了思路。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.