Tetragonal Single-Crystalline Boron Nanowires with Strong Anisotropic Light Scattering Behaviors and Photocurrent Response in Visible-Light Regime
Tetragonal Single-Crystalline Boron Nanowires with Strong Anisotropic Light Scattering Behaviors and Photocurrent Response in Visible-Light Regime
复制标题
可见光范围内具有强各向异性光散射行为和光电流响应的四方单晶硼纳米线
作者：
Peng Luxi;Wen Jinxiu;Zheng Zebo;Chen Huanjun;Xu Ningsheng;Chen Jun;Deng Shaozhi;Liu Fei;Deng SZ;Liu F
硼是一种窄带隙（1.56 eV）半导体，具有高熔点、低密度、大杨氏模量和非常高的折射率（3.03），接近硅。因此，预期硼纳米结构具有强可见光散射性质。然而，迄今为止，对硼纳米结构的光子学和光电学性质的研究还很少。本文成功地在Si衬底上制备了高密度的单晶硼纳米线（BNW）阵列。发现所有的BNW在可见光区都具有很强的光散射行为。最重要的是，散射光被发现沿着纳米线的纵向方向。它们在超快激光照射下也具有优异的二次谐波产生（SHG）性能。进一步的光电测量表明，单个BNW器件在环境条件下在可见光范围内表现出显著的光电流响应，这可以归因于单个BNW与可见光之间的强耦合效应。单根BNW在10 V电压下的最大光响应率可达12.12 A W-1，响应时间仅为18 ms，在可见光通信和探测领域具有广阔的应用前景。
Boron is a narrow‐bandgap (1.56 eV) semiconductor with high melting‐point, low‐density, large Young's modulus and very high refractive index (3.03) close to silicon. Therefore, boron nanostructures is expected to possess strong visible‐light scattering properties. However, photonic and optoelectronic properties of the boron nanostructures are seldom studied until now. In this paper, we have successfully prepared single‐crystalline boron nanowire (BNW) arrays with high‐density on Si substrate. All the BNWs are found to possess strong light‐scattering behaviors in the visible regime. Most of all, the scattered light is found to polarize along the longitudinal direction of the nanowire. They also have excellent second‐harmonic generation (SHG) properties under ultrafast laser irradiation. Further optoelectronic measurements show that an individual BNW device exhibits notable photocurrent responses in the visible‐light range at ambient conditions, which can be attributed to the strong coupling effect between individual BNW and the visible light. The maximum photoresponsivity of an individual BNW can reach up to 12.12 A W–1at a voltage of 10 V, and the response time is only 18 ms. Therefore, it unveils that the BNWs have a promising future in visible‐light communications and detections.