Nanogenerators: Optimization of the Output Efficiency of GaN Nanowire Piezoelectric Nanogenerators by Tuning the Free Carrier Concentration (Adv. Energy Mater. 16/2014)

In article number 1400392, Chuan-Pu Liu and co-workers report the synthesis of Si-doped GaN nanowire arrays with various carrier concentrations to investigate the impact of carrier screening on the output performance of alternating-current (AC) vertical integrated nanogenerators (VINGs). The output voltage and current density of AC VINGs strongly decrease with increasing doping concentration. Consequently, AC VINGs can be optimized if they are composed of piezotronic materials with the lowest possible carrier concentration to prevent the screening effect.