Accessibility Tools

Condensed Matter Physics Seminar

Condensed Matter Physics Seminar Online

III-nitride tunnel junctions and its application in bidirectional light-emitting diodes

23-01-2024 14:00 - 15:00
Venue
Zoom seminar, Instytute of Physics P.A.S.
Telephone
Email
This email address is being protected from spambots. You need JavaScript enabled to view it.
Speaker
Mikołaj Żak
Affiliation
Institute of High Pressure Physics of the Polish Academy of Sciences

The application of tunnel junctions (TJs) into gallium nitride (GaN) based optoelectronic structures provides new opportunities for the design of novel devices such as vertically integrated multicolor light-emitting arrays or high-power laser diode stacks. For a long time, high tunneling currents could not be achieved due to the high GaN energy gap of 3.4 eV. Polarization field engineering in TJs (mainly by introducing a thin InGaN layer), combined with heavy doping, enabled tunneling currents to be significantly increased. Furthermore, by developing a high-quality TJ, we were able to demonstrate a bidirectional light-emitting diode (BD LED). This is an innovative structure in which the active region is surrounded on both sides by p-type regions followed by tunnel junctions. This allows carriers to be injected to the same quantum well regardless of the BD LED’s bias - with both positive and negative voltages. Thanks to this unique property, BD LEDs can be considered as a new group of optoelectronic devices powered directly with alternating current (AC).

During the seminar, I will describe our contribution to the development of III-nitride TJs from an experimental and theoretical perspective. I will also present the properties of symmetrical BD LEDs and discuss the prospects behind these devices.

 
 

List of Dates (Page event details)

  • 23-01-2024 14:00 - 15:00
Save
Cookies user preferences
We use cookies to ensure you to get the best experience on our website. If you decline the use of cookies, this website may not function as expected.
Accept all
Decline all
Read more
Essential
Essential cookies
These cookies are necessary for the correct operation of the website and therefore cannot be disabled on this level; the use of these cookies does not involve the processing of personal data. While you can disable them via your browser settings, doing so may prevent the website from working normally.
Accept
Analytical cookies
These cookies are particularly intended to enable the website administrator to monitor the website traffic statistics, as well as the sources of traffic. Such data is typically collected anonymously.
Google Analytics
Accept
Decline