The lattice reconstruction of Cs-introduced FAPbI1.80Br1.20 enables improved stability for perovskite solar cells,RSC Advances

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The lattice reconstruction of Cs-introduced FAPbI1.80Br1.20 enables improved stability for perovskite solar cells
RSC Advances ( IF 3.9 ) Pub Date : 2021-1-20 , DOI: 10.1039/d0ra09294k
Shuang Chen ₁ , Lu Pan ₁ , Tao Ye ₁ , Nuo Lei ₁ , Yijun Yang ₁ , Xi Wang ₁

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Inorganic–organic hybrid perovskite solar cells (PSCs) have stirred up a new research spree in the field of photovoltaics due to its high photoelectric conversion efficiency and simple preparation process. In recent years, the research of inorganic–organic hybrid PSCs has been widely reported, among which FA⁺/Cs⁺ PSCs are especially outstanding. However, there are few reports explaining the lattice structural change mechanism of Cs_xFA_1−xPbI_1.80Br_1.20 PSCs from the view of chemical bonds. In this work, a facile method of 15% Cs⁺ cations partially substituting FA⁺ cations has been presented to enhance the structural stability and photovoltaic performances of FAPbI_1.80Br_1.20 PSCs. The partial incorporation of Cs⁺ in FAPbI_1.80Br_1.20 resulted in a more beneficial tolerance factor and inhibited the deep defect state of elemental Pb. More importantly, it inhibited the phase transition from the cubic black α-phase to the hexagonal yellow δ-phase of FAPbI_1.80Br_1.20. Moreover, the power conversion efficiency (PCE) of Cs_0.15FA_0.85PbI_1.80Br_1.20 PSCs achieved a substantial improvement. The stability also achieved a remarkable promotion, which was demonstrated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and Nuclear Magnetic Resonance (NMR). These analyses indicate that 15% Cs⁺ can induce the lattice shrinkage, reduce the specific traps and inhibit the phase transition, thus improving the structural stabilities of Cs_0.15FA_0.85PbI_1.80Br_1.20 PSCs under atmosphere and calefaction. These results provide an effective way for fabricating stable and efficient inorganic–organic perovskite solar cells with promising properties.

中文翻译：

Cs 引入的 FAPbI1.80Br1.20 的晶格重构可提高钙钛矿太阳能电池的稳定性

无机-有机杂化钙钛矿太阳能电池（PSC）以其较高的光电转换效率和简单的制备工艺在光伏领域掀起了新的研究热潮。近年来，无机-有机杂化PSCs的研究被广泛报道，其中FA ⁺ /Cs ⁺ PSCs尤为突出。然而，从化学键角度解释Cs _x FA _{1− x} PbI _1.80 Br _1.20 PSCs晶格结构变化机制的报道很少。在这项工作中，提出了一种用 15% Cs ⁺阳离子部分取代 FA ⁺阳离子的简便方法，以增强 FAPbI _1.80 Br _1.20 PSC 的结构稳定性和光伏性能。 FAPbI _1.80 Br _1.20中部分掺入 Cs ⁺产生更有利的耐受因子并抑制元素 Pb 的深层缺陷态。更重要的是，它抑制了FAPbI _1.80 Br _1.20从立方黑色α相到六方黄色δ相的相变。此外，Cs _0.15 FA _0.85 PbI _1.80 Br _{1 的功率转换效率（PCE）。}20 个 PSC 取得了实质性改进。 X射线光电子能谱（XPS）、X射线衍射（XRD）和核磁共振（NMR）证明了稳定性的显着提升。这些分析表明，15% Cs ⁺可以引起晶格收缩，减少特定陷阱并抑制相变，从而提高 Cs _0.15 FA _0.85 PbI _1.80 Br _1.20 PSC 在大气和加热下的结构稳定性。这些结果为制造稳定、高效、具有良好性能的无机-有机钙钛矿太阳能电池提供了一种有效的方法。

更新日期：2021-01-20

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