High-quality borophene quantum dot realization and their application in a photovoltaic device,Journal of Materials Chemistry A

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High-quality borophene quantum dot realization and their application in a photovoltaic device
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-09-28 , DOI: 10.1039/d1ta06524f
Anran Zhao _{1,

2} , Yu Han _{2,

3} , Yuhang Che _{2,

3} , Qi Liu _{1,

2} , Xiyang Wang ₄ , Qi Li _{1,

2} , Jie Sun _{1,

2} , Zhibin Lei _{1,

2} , Xuexia He _{1,

2} , Zong-Huai Liu _{1,

2}

Affiliation

Surface modification is an effective strategy to promote charge transport and extraction, reduce the carrier recombination probability, and ultimately improve the performance of perovskite solar cells (PSCs). Borophene is the lightest two-dimensional (2D) layered material, with high carrier mobility and high hardness. In this work, a sonication-assisted liquid-phase preparation technique was developed to prepare borophene quantum dots (BQDs) with uniform size, good dispersion, and high stability. The use of BQDs as a surface passivation agent on the TiO₂ layer in an inorganic CsPbI₂Br solar cell was presented. It is found that the boron atoms undergo strong interactions with TiO₂ and the perovskite, reducing interfacial recombination and forming a cascade energy alignment for effective charge transport. A CsPbI₂Br solar cell with a thin BQD interlayer shows high efficiency of 15.31%, whereas the efficiency was 14.24% for the device with no BQDs. The enhancement in efficiency is mainly due to carrier recombination suppression and a decrease in the defect density at the TiO₂/CsPbI₂Br interface after BDQ treatment. This work demonstrates that high-quality BQDs have great potential to be applied in perovskite solar cells and other optoelectronic devices.

中文翻译：

高质量硼烯量子点的实现及其在光伏器件中的应用

表面改性是促进电荷传输和提取、降低载流子复合概率并最终提高钙钛矿太阳能电池（PSC）性能的有效策略。Borophene 是最轻的二维 (2D) 层状材料，具有高载流子迁移率和高硬度。在这项工作中，开发了一种超声辅助液相制备技术来制备尺寸均匀、分散性好、稳定性高的硼烯量子点（BQDs）。介绍了在无机 CsPbI ₂ Br 太阳能电池中使用 BQD 作为 TiO ₂层上的表面钝化剂。发现硼原子与TiO ₂发生强烈的相互作用和钙钛矿，减少界面复合并形成有效电荷传输的级联能量排列。具有薄 BQD 中间层的 CsPbI ₂ Br 太阳能电池显示出 15.31% 的高效率，而没有 BQD 的器件的效率为 14.24%。效率的提高主要是由于载流子复合抑制和BDQ 处理后TiO ₂ /CsPbI ₂ Br 界面处缺陷密度的降低。这项工作表明，高质量的 BQDs 在钙钛矿太阳能电池和其他光电器件中具有巨大的应用潜力。

更新日期：2021-10-25

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