News Article

GaAs-based Devices: How To Choose A Suitable Substrate

There are a number of companies that sell GaAs substrates grown by LEC or VGF, but what is the difference? Russ Kremer and Steffen Teichert provide some answers.
One of the more interesting questions that arises when considering the production of GaAs-based devices relates to the proper choice of substrate. Today s substrate suppliers currently mass-produce two types of wafer. These are based on two different crystal growth principles: the Czochralski process and the Bridgman process. With both methods it is possible to grow large-diameter, semi-insulating (as well as semiconducting) crystals for applications in micro- and optoelectronics.

The material is usually classified according to the crystal growth technology used in its manufacture. For the user, it is more meaningful to designate materials by their properties rather than by the production technology used. The two available substrate types are often called "low EPD" and "high EPD" material. The etch pit density (EPD) measures the dislocation density of the substrate. For semi-insulating GaAs, typical EPDs for material specified as high or low EPD are

CS International to return to Brussels – bigger and better than ever!


The leading global compound semiconductor conference and exhibition will once again bring together key players from across the value chain for two-days of strategic technical sessions, dynamic talks and unrivalled networking opportunities.


Join us face-to-face between 28th – 29th June 2022

  • View the agenda.
  • 3 for the price of 1. Register your place and gain complementary access to TWO FURTHER industry leading conferences: PIC International and SSI International.
  • Email info@csinternational.net  or call +44 (0)24 7671 8970 for more details.

*90% of exhibition space has gone - book your booth before it’s too late!

Register


×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
Live Event