Harnessing the Interplay between Photonic Resonances and Carrier Extraction for Narrowband Germanium Nanowire Photodetectors Spanning the Visible to Infrared,ACS Photonics

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Harnessing the Interplay between Photonic Resonances and Carrier Extraction for Narrowband Germanium Nanowire Photodetectors Spanning the Visible to Infrared
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-27 00:00:00 , DOI: 10.1021/acsphotonics.7b01034
Amit Solanki ₁ , Shiqiang Li ₂ , Hyunsung Park ₁ , Kenneth B. Crozier _{2,

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Affiliation

At visible wavelengths, photodetection in three channels (red, green, and blue) enables color imaging. Yet the spectra of most materials provide richer information than just color, and therefore considerable interest exists for imaging with multiple spectral bands across the visible to infrared. This endeavor requires narrowband photodetection, which is generally achieved by combining broadband photodetectors with filters or spectrometers, but with added bulk and cost. Here we report, for the first time to our knowledge, vertical germanium nanowires as narrowband photodetectors. Our devices exhibit spectral response peaks that are as narrow as 40 nm and can be shifted from visible (∼600 nm) to infrared (∼1600 nm) wavelengths by appropriate design. The spectral selectivity arises from the nanowires acting as waveguides and, surprisingly, is enhanced by radial narrowing of the carrier collection region due to surface recombination. The incorporation of germanium into integrated circuits in a high-yield and cost-effective manner is well-established, making our approach promising for many detection applications.

中文翻译：

利用跨可见光到红外的窄带锗纳米线光电探测器的光子共振和载流子提取之间的相互作用

在可见波长处，通过三个通道（红色，绿色和蓝色）的光电检测可以进行彩色成像。然而，大多数材料的光谱不仅提供颜色信息，还提供更丰富的信息，因此，对于在可见光到红外光之间具有多个光谱带的成像存在相当大的兴趣。这项工作需要窄带光电检测，这通常是通过将宽带光电检测器与滤波器或光谱仪结合使用来实现的，但是增加了体积和成本。在这里，我们首次向我们报告了垂直锗纳米线作为窄带光电探测器的情况。我们的设备显示的光谱响应峰窄至40 nm，并且通过适当的设计可以从可见光（〜600 nm）转变为红外（〜1600 nm）波长。光谱选择性是由充当波导的纳米线产生的，令人惊讶的是，由于表面复合，载体收集区的径向变窄增强了β-β-内酰胺的结合。以高产量和高成本效益的方式将锗掺入集成电路已广为人知，这使我们的方法有望用于许多检测应用。

更新日期：2017-11-27

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