二维锡混合卤化物钙钛矿的振动和结构性质

IF 0.4 Q4 NANOSCIENCE & NANOTECHNOLOGY Nano Hybrids and Composites Pub Date : 2023-07-31 DOI:10.4028/p-KAXS1n
S. Hartati, P. Y. D. Maulida, T. Zakly, I. Mulyani, D. Onggo, M. H. Mahyuddin, A. Noviyanto, A. Arramel, N. Rochman
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引用次数: 0

摘要

二维(2D)杂化金属卤化物钙钛矿的出现引起了光电器件和发光应用的极大关注。由于铅基钙钛矿的毒性可能对环境有害,一些研究试图将活性金属改为锡(Sn)。本文采用x射线荧光(XRF)、x射线衍射(XRD)和傅里叶变换红外(FTIR)光谱对(PEA)2SnBrxI4-x混合卤化物钙钛矿进行了表征。定性XRF分析表明,在中z和高z范围内存在锡,溴和碘的排放。在中z区,Br-Kα峰出现在11.96 keV处,Br-Kβ峰出现在13.3 keV处。Sn-Kα、I-Kα、I-Kβ1和I-Kβ2分别在25.24 keV、28.6 keV、32.35 keV和33.11 keV的高z范围内检测到峰。因此,混合卤化物组分的元素组成表现出指示性控制,通过合理的化学设计可以合成富溴或富碘。XRD谱图在峰5.18°处(对应(002)面)显示出系统的递进,明确了调整锡基杂化钙钛矿卤化物组成的可行性。证实了(2D)杂化金属卤化物与可调卤化物在富溴和富碘组成中具有相同的结构。此外,随着溴组成的增加,2θ峰的角度略有降低。在FTIR光谱中,~500 cm-1上的C−I键和~600 cm-1上的C- br键的存在突出了有机阳离子的官能团。这些实验结果为实现用于光电子和闪烁体的二维锡混合卤化物钙钛矿的复合工程奠定了基础。
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Vibrational and Structural Properties of Two-Dimensional Tin Mixed-Halide Perovskites
The emergence of two-dimensional (2D) hybrid metal-halide perovskites has garnered significant attentions for optoelectronic devices and light-emitting applications. Since the toxicity of lead-based perovskites could potentially be harmful to the environment, several works have attempted to change the active metal to tin (Sn). Here, we investigate the characterization of (PEA)2SnBrxI4-x mixed halide perovskites using X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. Qualitative XRF analysis suggests the presence of tin, bromine and iodine emissions under the mid-Z and high-Z ranges. In mid-Z range, Br-Kα peak appeared on 11.96 keV and Br-Kβ was detected on 13.3 keV. Meanwhile Sn-Kα, I-Kα, I-Kβ1, and I-Kβ2 peaks were detected in high-Z range on 25.24 keV, 28.6 keV, 32.35 keV and 33.11 keV, respectively. Thus, the elemental composition of mixed halide components exhibits an indicative control that bromine-rich or iodine-rich can be synthesized via rational chemical design. XRD pattern display a systematic progression at the peak 5.18° (corresponds to (002) plane), which unambiguously demonstrated the feasibility to tune halide composition in tin-based hybrid perovskite. It also confirms that (2D) hybrid metal-halide with tunable halide have identical structure for both bromine-rich and iodine-rich composition. Furthermore, the 2θ peaks slightly shifted to lower angle with increasing bromine composition. The presence of C−I bonding on ~500 cm-1 and C-Br bond on ~600 cm-1 in FTIR spectra highlights the functional group of organic cations. These experimental results promote a foundation to implement compositional engineering on 2D-tin mixed-halide perovskites for optoelectronics and scintillators.
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Nano Hybrids and Composites
Nano Hybrids and Composites NANOSCIENCE & NANOTECHNOLOGY-
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