Wednesday, November 27, 2019

Whispering-Gallery-Mode Resonance Enhances Si PD Responsivity at 1,000nm

EurekaAlert reports that Korean POSTECH University developed a photodiode with increased absorption of the NIR light by using the hourglass-shaped silicon nanowire array. The research team was led by Prof. Chang-Ki Baek and consisted of Kihyun Kim, Myunghae Seo, and Sol Yoon. The team has proved that the hourglass-shaped silicon-nanowire photodiodes has 29% increased NIR photoreseponse at 1,000nm in comparison to the existing planar type silicon photodiode.

Prof. Chang-Ki Baek said “this study used the existing silicon processes that can be produced in mass at low cost and 100% compatible to the semiconductor production. It is very meaningful in that we were able to demonstrate increased photoresponse of the near-infrared light at the wavelength where the existing silicon hardly detect. It is possible that the developed device can optimize the absorption of the near-infrared wavelength desired according to the structure of nanowires such as diameter, length, and pitch. It is expected to provide optical solutions to various fields such as LiDAR of a self-driving vehicles, medical laser, military night vision goggles, image sensors and more.


  1. What is the impact on dark current? [Perhaps it is in the Nature paper but oddly I cannot access it via my university. Maybe it is a cost-savings thing here....]

  2. I tried through the University of Arizona and that doesn't work either.

  3. From The UArizona Library -
    The problem with this article is that it is an "online before print" resource. Some journals don't allow us access to pre-print articles and unfortunately the Nature package is one of them. I searched other articles from volumes in Nature Electronics and they display and can be downloaded. Once the article is fully vetted and assigned an issue and page numbers, we'll have access to it.


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