在银-石双倍洛夫斯基特中对载荷运输产生影响
Marcello Righetto1, Sebastián Caicedo-Dávila2, Maximilian T Sirtl3
1Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
The journal of physical chemistry letters
|November 10, 2023
概括
合金半导体可以通过为本地化载体创建陷来阻碍电荷传输. 这项研究揭示了合金冲击如何在双矿中充电运输,为高效的半导体提供了新的设计见解.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 半导体物理 半导体物理
背景情况:
- 合金对于调整光电子和光伏中的半导体性能至关重要.
- 目前的合金策略主要集中在带隙工程上,往往忽视了电荷载体运输优化.
- 合金对电荷载体运输的影响,特别是当有局部载体 (如小极子) 存在时,仍未得到充分研究.
研究的目的:
- 研究Cs2AgSbBi1-xBr6双矿薄膜中的合金和电荷载体定位之间的相互作用.
- 了解不同的载荷载体运输模式如何影响合金对材料性能的影响.
- 确定合金策略的局限性,并为先进的半导体材料提供设计原则.
主要方法:
- 反射传输光谱学是反射传输光谱学.
- 光学-特拉赫兹探针光谱学
- 第一个原则计算计算.
主要成果:
- 电荷载体变得局部化时,合金可以严重限制电荷载体运输 (例如,作为小极子).
- 最初的移位载体探测合金电子带,而随后的局部载体与当地的能量景观相互作用.
- 合金内的低能量位点 (例如Sb位点) 作为局部载体的陷,显著降低了运输特性.
结论:
- 配合策略具有固有的局限性,可能会对载荷运输产生负面影响.
- 负载载体运输模式关键决定了合金如何影响材料性能.
- 通过考虑载体定位效应,研究结果为开发新的高效半导体材料提供了必不可少的设计工具.
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