功函数的光学操纵在金属薄膜上形成对比。,Science Advances

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功函数的光学操纵在金属薄膜上形成对比。
Science Advances ( IF 11.7 ) Pub Date : 2018-Mar-01 , DOI: 10.1126/sciadv.aao6050
Sai Kishore Ravi ₁ , Wanxin Sun ₂ , Dilip Krishna Nandakumar ₁ , Yaoxin Zhang ₁ , Swee Ching Tan ₁

Affiliation

功函数是每个光电器件中确保特定电荷传输方案的关键指标。但是，在给定的功函数范围内可用的稳定导电材料的数量很少，因此必须进行功函数调制。与以前所有的功函数调制化学方法不同，我们在这里介绍一种涉及光调制的替代方法。功函数是将电子从固体中发射到真空中所需的最小能量，并且已知与光强度无关。在涂覆在半导体上的金属薄膜中观察到功函数的“光强度依赖性”变化。通过与三个不同的系统，即Au / n-Si，Pt / n-Si和W / n-Si，对这种新现象与现有的功函数概念进行了对比，并对其进行了确认。²。现在只需将光强与手握的几种离散金属一起调节，就可以将功函数连续调节至指定范围。此外，选择性照明会在金属膜上产生功函数对比，从而实现面内电荷传输。这为光电子器件的设计和理解提供了新的思路。有鉴于此，我们还提出了一种对照明方向敏感的简单光电探测器设计。

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Optical manipulation of work function contrasts on metal thin films.

Work function is a crucial metric in every optoelectronic device to ensure a specific charge transport scheme. However, the number of stable conductive materials available in a given work function range is scant, necessitating work function modulation. As opposed to all the previous chemical methods of work function modulation, we introduce here an alternative approach involving optical modulation. The work function is the minimum energy needed to eject an electron from a solid into vacuum and is known to be light-intensity-independent. A "light intensity dependent" change in work function was observed in metallic thin films coated on a semiconductor. This new phenomenon, contrasting the existing notions on work function, was tested and affirmed with three different systems, namely, Au/n-Si, Pt/n-Si, and W/n-Si. A work function shift of 0.22 eV is achieved in the Pt/n-Si system merely by tuning the illumination intensity from 0 to 18 mW/cm². Continuous tuning of work functions to a specified range is now possible just by tuning the light intensity with a few discrete metals in hand. Moreover, selective illumination creates a work function contrast on the metal film, enabling in-plane charge transport. This throws new light on the design and understanding of the optoelectronic devices. In light of this, we also present a simple photodetector design that is sensitive to illumination direction.

更新日期：2018-03-06

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