CaF2 纳米粒子诱导的 γ-CsPbI2.81Br0.19 异质结晶用于高效柔性全无机过氧化物太阳能电池

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2024-10-14 DOI:10.1021/acs.jpclett.4c02603

Huijing Liu, Zhiyu Zhang, Huifang Han, Lingqi Xu, Yao Fu, Kun Lang, Fan Shen, Pengchen Zou, Xuewei Liu, Jia Xu, Jianxi Yao

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引用次数: 0

摘要

全无机 CsPbI3 薄膜需要较高的退火温度才能实现高质量结晶。因此，传统的低温溶液方法通常会导致柔性 CsPbI3 薄膜结晶不良，从而显著降低柔性过氧化物太阳能电池（f-PSCs）的光电性能和稳定性。在此，我们成功地利用异质 CaF2 纳米晶种子诱导策略实现了柔性 CsPbI2.81Br0.19 薄膜的强化结晶。由于 CaF2 纳米粒子与包晶材料具有良好的晶格匹配性，它们可以降低 CsPbI2.81Br0.19 包晶成核的临界吉布斯自由能，从而在低温下加速 CsPbI2.81Br0.19 的 γ 相结晶。这就提高了柔性包晶体薄膜在低温下的结晶质量，最大程度地减少了缺陷，增强了 f-PSC 的稳定性。CsPbI2.81Br0.19 f-PSC 实现了 15.03% 的冠军功率转换效率，并表现出机械稳定性，即使在曲率半径为 5 毫米的条件下弯曲 60,000 次后，仍能保持 98.1% 的初始效率。

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CaF2 Nanoparticle-Induced γ-CsPbI2.81Br0.19 Heterogeneous Crystallization for High-Efficiency Flexible All-Inorganic Perovskite Solar Cells

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CaF2 Nanoparticle-Induced γ-CsPbI2.81Br0.19 Heterogeneous Crystallization for High-Efficiency Flexible All-Inorganic Perovskite Solar Cells

All-inorganic CsPbI₃ films necessitate higher annealing temperatures for high-quality crystallization. Consequently, the conventional low-temperature solution approach often results in poor crystallization in flexible CsPbI₃ films, significantly degrading the optoelectronic performance and stability of flexible perovskite solar cells (f-PSCs). Herein, a heterogeneous CaF₂ nanocrystal seed-induced strategy has been successfully utilized to achieve enhanced crystallization of a flexible CsPbI_2.81Br_0.19 film. Due to their good lattice match with the perovskite material, CaF₂ nanoparticles can decrease the critical Gibbs free energy of CsPbI_2.81Br_0.19 perovskite nucleation, thereby accelerating γ-phase CsPbI_2.81Br_0.19 crystallization at low temperatures. This leads to an improved crystalline quality of the flexible perovskite film at low temperatures, which minimizes defects and enhances the stability of f-PSCs. The CsPbI_2.81Br_0.19 f-PSCs achieved a champion power conversion efficiency of 15.03% and demonstrated mechanical stability, retaining 98.1% of their initial efficiency even after 60 000 bending cycles with a curvature radius of 5 mm.

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.