Study on Nonlinear Dynamic Responses of the p–n GaN/AlN Heterojunction in Piezoelectric Semiconductor Composite Fibers

Herein, a p–n GaN/AlN heterojunction in a piezoelectric semiconductor (PSC) composite fiber driven by dynamic magnetic loads is studied. The numerical results of nonlinear dynamic responses of a composite p–n heterojunction subjected to a time‐harmonic magnetic load and a pulse magnetic load are obtained by the finite‐element method, respectively. The effects of different magnetic loads on the I–V curve and piezoelectric behavior of a composite p–n heterojunction are investigated. Numerical results show that when driven by uniformly dynamic magnetic loads, the electromechanical fields show significant asymmetry due to electric nonlinearity. The time‐harmonic magnetic loads drive the round‐trip motion of electrons and holes, and the dynamic electric behaviors driven by pulsed magnetic loads are nonlinear pulse motions. Further analysis of the p–n heterojunction subjected to the bias voltage shows that positive magnetic loads increase the depletion layer's width but decrease the carrier concentration. The results presented in this study have a referential significance to contactless performance tuning of a PSC heterojunction structure and new‐generation piezotronic devices. Herein, nonlinear dynamic responses of the p–n GaN/AlN heterojunction in piezoelectric semiconductor (PSC) composite fibers are studied for the first time, and a finite‐element method is proposed to solve the nonlinear boundary value problems where PSC fibers are subjected to contactless magnetic loads. The effects of different magnetic loads on the I–V curve and piezoelectric behaviors are investigated.