The papers included in this issue of ECS Transactions were originally presented in the symposium ¿State-of-the-Art Program on Compound Semiconductors 52 (SOTAPOCS 52)¿, held during the 218th meeting of The Electrochemical Society, in Las Vegas, Nevada from October 10 to 15, 2010.

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 contain the most recent developments in compound semiconductors encompassing advanced devices, materials growth, characterization, processing, device fabrication, reliability, and other related topics, as well as the most recent developments in processes at the semiconductor/solution interface including etching, oxidation, passivation, film growth, electrochemical and photoelectrochemical processes, electroluminescence, photoluminescence, and other related topics.