Crystallization regulation and ion migration suppression enabled by bifunctional lithium difluoro (oxalato) borate additive for stable perovskite solar cells

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2025-06-14 DOI:10.1016/j.orgel.2025.107285

Rana Shahid Mahmood , Weicun Chu , Riming Nie

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Abstract

Although perovskite solar cells (PSCs) are growing rapidly to achieve higher photovoltaic performance, their practical applications have still been obstructed by stability issues in humid atmosphere. Here, we adopted an additive engineering (one additive in two layers) strategy by doping organic-inorganic dual nature additive lithium difluoro(oxalato)borate (Li-DFOB) into lead iodide (PbI₂) and Spiro-OMeTAD, resulting in enhanced photovoltaic performance and long-term stability of PSCs. The incorporation of Li-DFOB can enhance perovskite crystal quality and moisture resistance of the hole transporting layer by suppressing ion migration, charge carrier recombination, and reducing hysteresis. A replacement of Li-TFSI with a stable Li-DFOB salt in Spiro-OMeTAD can increase the hydrophobicity of the hole transporting layer (HTL) by preventing degradation in humid air and improve the charge carrier transportation. The prepared devices can maintain 98.7 % of their initial power conversion efficiency (PCE), 24.07 % after 624 h in ambient conditions. This additive engineering strategy recommends such dual-nature additives to enhance the performance and stability of PSCs, leading to water-resistant devices.

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双功能双氟硼酸锂添加剂对稳定钙钛矿太阳能电池的结晶调节和离子迁移抑制作用

尽管钙钛矿太阳能电池（PSCs）正在迅速发展，以实现更高的光伏性能，但其在潮湿大气中的稳定性问题仍然阻碍了其实际应用。本研究采用增材工程（两层一种添加剂）策略，在碘化铅（PbI2）和Spiro-OMeTAD中掺杂有机-无机双性质添加剂二氟硼酸锂（Li-DFOB），提高了PSCs的光伏性能和长期稳定性。Li-DFOB的掺入可以抑制离子迁移、载流子复合和减小磁滞，从而提高钙钛矿晶体质量和孔输运层的抗湿性。在Spiro-OMeTAD中，用稳定的Li-DFOB盐代替Li-TFSI，可以通过防止潮湿空气中的降解来提高空穴输运层（HTL）的疏水性，改善载流子的输运。所制备的器件在环境条件下624 h后可保持其初始功率转换效率（PCE）的98.7%和24.07%。这种添加剂工程策略建议使用这种双重性添加剂来增强psc的性能和稳定性，从而产生防水设备。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.