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国家自然科学基金(11304220)

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相关作者:王娜顾洪恩更多>>
相关机构:天津城建大学天津大学更多>>
发文基金:国家自然科学基金天津市自然科学基金更多>>
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Electronic structures and NIR-II optical properties of black phosphorus using first principles
2022年
Near infrared-II(NIR-II, 1 000-1 700 nm) imaging with high penetration tissue depth and signal-noise ratio has attracted wide interest in biomedicine. As a two-dimensional(2D) material with narrow band gap, the band structure of layered black phosphorus, as an important characteristic of electronic structure, determines the electronic transport and infrared optical properties, which show great potential in NIIR-II imaging. Here, the electronic structure and NIR-II optical properties of black phosphorus have been investigated in detail by employing the generalized gradient approximation + U(GGA+U) correction based on density functional theory(DFT). First, we performed the band structure and density of states for different layers of black phosphorus. From the electronic structures, the location of valence band maximum didn’t shift obviously, and the position of conduction band minimum shifted downward gradually, inducing the band gaps decreased gradually with the increasing layer number. While the layer number increased to 5, the behaviour of electronic structure was very similar to that of the bulk black phosphorus. Then, we calculated the NIR-II optical properties, and found the optical band gap of black phosphorus also showed layer dependent properties. From a single layer to 5 layers, the optical band gap changed from 1.71 e V to 0.92 e V. It is noting that black phosphorus also showed the significant optical absorption in NIR-IIa(1 300-1 400 nm) and NIR-IIb(1 500-1 700 nm) windows. Especially, the NIR-II optical absorption can be enhanced with increasing the layer number to 5, indicating promising photoresponse materials in NIR-II imaging.
HONG XiaofengGUO MeiliLIU LingLI YonghuiZHANG Xiaodong
关键词:PHOSPHORUSBLACKOPTICAL
电注入着色氟化钡晶体F色心的扩散激活能
2014年
在8组不同的温度和电压条件下,用自行设计的电注入实验装置对氟化钡晶体进行点阴极电注入着色。测试和分析了电注入着色前后氟化钡晶体的吸收光谱。研究结果表明:电注入着色后氟化钡晶体中产生了大量F色心。电注入过程中,F色心首先在阴极注入点附近产生,然后逐渐向阳极扩散。通过测试晶体着色深度并利用F色心迁移率与温度的关系确定出了电注入着色氟化钡晶体中F色心的扩散激活能。
王娜顾洪恩
关键词:氟化钡电注入扩散激活能
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