HEMT NEXAFS 2 Sensor 2 Transistor 2 XPS 2 Zwitterion 2 2-dimensional electron gas 1 ADSORPTION 1 AMINO-ACIDS 1 AlGaN/GaN heterostructures 1 Aluminum gallium nitride 1 Amino acids 1 Carboxylation 1 Chemical and biological sensing 1 Conductivity measurements 1 ELECTRONIC-STRUCTURE 1 ENERGIES 1 Electric conductivity measurement 1 Electron gas 1 GAN 1 GLYCYL-GLYCINE 1 Gallium nitride 1 High electron mobility transistors 1 III-V semiconductors 1 INNERSHELL ABSORPTION-SPECTROSCOPY 1 Intermolecular interactions 1 Molecules 1 Phase interfaces 1 Preferential orientation 1 SHELL EXCITATION 1