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.

This volume contains papers from two symposia: State of the Art Program on Compound Semiconductors 45 and Wide Bandgap Semiconductor Materials and Devices VII.

This issue of ECS Transactions focuses on issues pertinent to development of wide-bandgap semiconductor materials and device applications: inorganic wide-bandgap semiconductor materials, including III-nitrides, II-oxides, SiC, diamond, II-VI, and emerging 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.

Section 1 addresses the most recent developments in processes at the semiconductor-solution interface include etching, oxidation, passivation, film growth, porous semiconductor formation, electrochemical, photoelectrochemical, electroluminescence and photoluminescence processes, electroanalytical measurements and related topics on both elemental and compound semiconductors. Section 2 addresses the most recent developments in compound semiconductors encompassing advanced devices, materials growth, characterization, processing, device fabrication, reliability, and related topics.