This issue contains invited and contributed talks on the growth, processing, and characterization of electronic and photonic devices based upon compound semiconductor and oxide materials.

This issue of ECS Transactions focuses on issues pertinent to materials growth, characterization, processing, development, application of compound semiconductor materials and devices, including nitrides and wide-bandgap semiconductors.

The papers included in this issue of ECS Transactions were originally presented in the joint symposium ¿State-of-the-Art Program on Compound Semiconductors 51 (SOTAPOCS 51) and Wide-Bandgap Semiconductor Materials and Devices 10¿, held during the 216th meeting of The Electrochemical Society, in Vienna, Austria from October 4 to 9, 2009.

This issue contains the proceedings of both invited and contributed talks at the 47th State-Of-The-Art Programs on Compound Semiconductors (SOTAPOCS) symposium, and of the 8th Symposium on Wide Bandgap Semiconductors and Devices. The topics in this issue include some of the latest progress in compound and wide bandgap semiconductor development in fabrication processes, materials, characterization, devices, and reliability.