• Home
  • About Us
  • Contact Us
Semiconductor for You
  • Home
  • Semiconductor News
  • Technology
    • Automotive
    • Consumer Electronics
    • IoT
    • Lighting
    • Power Management
    • Wireless
    • Personal Electronics
    • Hardware & Software
    • Research
    • Medical Electronics
    • Embedded Design
    • Aerospace & Defence
    • Artificial Intelligence
  • DIY Projects
  • Market
  • Industries
    • Renesas Electronics
  • Knowledge Base
  • Events
  • Tools
    • Resistor Color Code Calculator
No Result
View All Result
  • Home
  • Semiconductor News
  • Technology
    • Automotive
    • Consumer Electronics
    • IoT
    • Lighting
    • Power Management
    • Wireless
    • Personal Electronics
    • Hardware & Software
    • Research
    • Medical Electronics
    • Embedded Design
    • Aerospace & Defence
    • Artificial Intelligence
  • DIY Projects
  • Market
  • Industries
    • Renesas Electronics
  • Knowledge Base
  • Events
  • Tools
    • Resistor Color Code Calculator
No Result
View All Result
Semiconductor for You
No Result
View All Result
Home Semiconductor News

Researchers Simplify Fabrication Of Nanowire UV-LEDs On Silicon

Semiconductor For You by Semiconductor For You
March 7, 2017
in Semiconductor News
0

KAUST team demonstrates dislocation-free AlGaN nanowires that spontaneously coalesce to allow device fabrication without planarisation

 

Figure :- ( (a) Top-view SEM image of device structure, and tilted-angle SEM of the nanowires in the inset; (b) STEM-HAADF image of coalesced AlGaN nanowires with schematic showing LED layer structure and measured UVLED emitting ~300 nm. 

There is a growing demand for mercury-free, environmentally friendly, compact UV LEDs for disinfection applications. Existing AlGaN-based planar UVLEDs, however, suffer from high dislocation densities, low light extraction efficiency and poor p-doping efficiency, which limits the irmaximum output power to several mWs at 20 mA. )

 

Dislocation-free AlGaN nanowires have shown better p-doping and light extraction efficiency but the growth of self-assembled, vertically oriented and uniform nanowires has remained a challenge. Furthermore, the nanowire-based LEDs require a planarisation process to first fill the gap between nanowires and then to make ohmic contacts. Planarisation is expensive and significantly reduces the light extraction efficiency due to the extreme absorption of the filling materials in the UV wavelengths.

Now researchers at KAUST (King Abdullah University of Science and Technology), led by Bilal Janjua and Haiding Sun, have reported synthesising AlGaN nanowires that spontaneously coalesce with a high density of ~1 x 1010 cm-2  (filling factor >95 percent) using plasma-assisted MBE on silicon.

They say that their approach, published in the journal Nanoscale, offers a viable way to easily fabricate ultra-thin UV LEDs on low-cost and scalable silicon substrates, without the planarisation step.

In addition, they demonstrated AlGaN quantum disks (Qdisks are the nanowire equivalent of quantum wells) in the nanowires and showed segregation of Al/Ga locally within the Qdisk (nanoclusters) that enhanced luminescence, similar to that reported in InGaN-based quantum wells.

AlxGa1-xN /AlyGa1-yN multiple quantum-disks should have superior carrier confinement and thus improve the optical performance of the device.  Device simulation results showed a large overlap of the electrons and holes wave functions in the active region because of the quantum confinement effect.

LEDs emitting at ~303 nm with a narrow FWHM (~20 nm) of the EL spectrum were demonstrated by using a large active region (‘active region/nanowire length-ratio’ ~ 50 percent) embedded with 15 stacks of AlxGa1-xN/AlyGa1-yN Qdisks.

According to the researchers, this is early work and more can be done to further improve the device performance. Nevertheless, they say their pendeo-epitaxy technique offers the possibility of simplifying the fabrication of a wide range of UV-nanowire devices such as lasers, photodetectors, modulators, and silicon integrated photonics.

‘Self-planarized quantum-disks nanowires ultraviolet-B emitter utilizing pendeo-epitaxy’ by Bilal Janjua et al, Nanoscale, 2017, DOI: 10.1039/C7NR00006E.

Content Protection by DMCA.com
Semiconductor For You

Semiconductor For You

Browse by Category

  • Aerospace and Defence
  • Articles
  • Automotive
  • Consumer-Electronics
  • Hardware & Software
  • Interview
  • IoT
  • Knowledge Base
  • Lighting
  • Market
  • personal-electronics
  • Power Management
  • Research
  • Semiconductor Events
  • Semiconductor News
  • Technology
  • Wireless
Semiconductor for You

Semiconductor For You is a resource hub for electronics engineers and industrialist. With its blend of
technology features, news and new product information, Semiconductor For You keeps designers and
managers up to date with the fastest moving industry in the world.

Follow Us

Browse by Category

  • Aerospace and Defence
  • Articles
  • Automotive
  • Consumer-Electronics
  • Hardware & Software
  • Interview
  • IoT
  • Knowledge Base
  • Lighting
  • Market
  • personal-electronics
  • Power Management
  • Research
  • Semiconductor Events
  • Semiconductor News
  • Technology
  • Wireless

Recent News

SEGGER’s Ozone now available for macOS on the M1/M2 (ARM-core) by popular demand

SEGGER’s Ozone now available for macOS on the M1/M2 (ARM-core) by popular demand

March 28, 2023
Infineon AIROC™ CYW20829 Bluetooth LE SoC ready with latest Bluetooth 5.4 specification

Infineon AIROC™ CYW20829 Bluetooth LE SoC ready with latest Bluetooth 5.4 specification

March 24, 2023
  • About
  • Advertise
  • Privacy & Policy
  • Contact

© 2022 Semiconductor For You

No Result
View All Result
  • Home
  • Semiconductor News
  • Technology
    • IoT
    • Wireless
    • Power Management
    • Automotive
    • Hardware & Software
  • Market
  • Knowledge Base
  • Tools
    • Resistor Color Code Calculator

© 2022 Semiconductor For You

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Cookie settingsACCEPT
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT