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.image (c) 2023 WILEY-VCH GmbH