-混合矿的不寻常的带隙曲效应是由混乱-顺序过渡引起的
Han Gao1, Dong He1, Zehua Chen2
1Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen 518055, Guangdong, China.
Science advances
|January 8, 2025
概括
-混合矿为近红外光电子提供可调节的带隙. 这项研究揭示了应变和库伦相互作用导致FAPb1-xSnxI3中不连续的带隙转移,从而使930nm红外光发射.
科学领域:
- 材料科学 材料科学 材料科学
- 光电学是指光电子产品.
- 纳米技术纳米技术
背景情况:
- 由于可调节的带隙,锡混合矿对近红外光电子有希望.
- 对带隙变化与Sn/Pb比率的基本理解受到薄膜分离问题的限制.
研究的目的:
- 为了合成立体测量单晶FAPb1-xSnxI3纳米晶体.
- 为了研究- Perowskites 的带隙变化背后的原子尺度机制.
主要方法:
- 单晶FAPb1-xSnxI3纳米晶体的固体测量合成.
- 原子尺度成像和系统性质测量.
- 发光二极管的制造和特征.
主要成果:
- 单晶FAPb1-xSnxI3纳米晶体已经成功合成并在原子尺度上成像.
- 应变和库伦相互作用诱导原子排序,导致x = 0.5.5附近的不连续带隙跳跃.
- 对FAPb0.6Sn0.4I3和FAPb0.4Sn0.6I3观察到~1.27 eV的最低带隙,而FAPb0.5Sn0.5I3的带隙为1.33 eV.
- 制造的LED发射了高达930nm的红外光.
结论:
- 由应变和库伦相互作用驱动的原子排序解释了FAPb1-xSnxI3.3.中的非线性带隙行为.
- 对矿纳米晶体中Sn/Pb比率的精确控制对于调整特定光电子应用的带隙至关重要.
- 这些发现为高效的近红外光电设备铺平了道路,这些设备基于锡的矿.
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