Band Gap Modulation of Orthorhombic Cesium Lead Iodide Perovskite Nanorods under High Pressure
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摘要: 全无机卤化物钙钛矿由于其稳定性强，且具有良好的光学性质，是一种很有前途的光电材料。然而，有效地设计其带隙以满足实际应用需求仍是亟待解决的关键问题。通过控制合成的反应时间和温度，对铯铅碘（CsPbI3）纳米材料进行形貌调控，合成出形貌均一、结晶性良好的棒状CsPbI3纳米材料。进一步利用金刚石对顶砧，结合原位高压紫外-可见吸收光谱，对CsPbI3纳米棒在高压下的带隙变化进行研究，发现高压下CsPbI3纳米棒的带隙减小，带隙的可调控性为纳米材料在光伏电池领域的应用奠定基础。研究结果不仅有助于在原子尺度上建立CsPbI3纳米棒的结构特性关系，而且为全无机钙钛矿纳米材料的实际应用提供重要线索。Abstract: The all-inorganic halide perovskite is a promising photoelectric material because of its strong stability and good optical properties. However, it is still a key problem to effectively design the band gap to meet the practical application requirements. By controlling the reaction time and temperature, the morphology of cesium-lead-iodine (CsPbI3) nano-material could be controlled, and the rod-like CsPbI3 nano-material with uniform morphology and good crystallinity was synthesized. The band gap changes of CsPbI3 nanorods under high pressure were further studied by using diamond pair anvil and in situ high pressure ultraviolet-visible absorption spectroscopy. It is found that the band gap of CsPbI3 nanorods decreases under high pressure, and the tunable band gap lays the foundation for the application of nano-materials in the field of photovoltaic cells. The results can not only help to establish the structural properties of CsPbI3 nanorods on the atomic scale. It also provides an important clue for the practical application of all-inorganic perovskite nano-materials.
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Key words:
- halide perovskites /
- diamond anvil cell /
- high pressure /
- band gap modulation
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图 1 CsPbI3纳米棒的TEM图像(a)、HRTEM图像(b)和映射图像(c)
Figure 1. TEM image (a), HRTEM image (b) and mapping images (c) of CsPbI3 nanorods
图 4 压力下CsPbI3纳米棒吸收光谱的变化
Figure 4. Changes of absorption spectra of CsPbI3 nanorods under pressure
图 5 卸压后的CsPbI3纳米棒的HRTEM图像(a)和STEM图像(b)
Figure 5. HRTEM image (a) and STEM image (b) of CsPbI3 nanorods after decompression
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