Research On Composite Energy Harvester Based On Piezoelectric-photoelectric Effec

In order to solve the limitation problem that general energy harvesters can only work under a certain condition,a composite energy harvester based on piezoelectric effect and photovoltaic effect is proposed,which can harvest low frequency vibration energy and solar energy in life.The energy harvester consists of a piezoelectric module,which is composed of ZnO nanorods to collect vibration energy using the principle of piezoelectric effect,and a photovoltaic module,which is composed of ZnO/Cu₂O heterojunction to collect solar energy using the principle of photovoltaic effect.ZnO nanorods in piezoelectric modules were prepared and characterized by hydrothermal method to investigate the effect of hydrothermal conditions on ZnO nanorods.The ZnO/Cu₂O heterojunction structures in the optoelectronic module were prepared and characterized by magnetron sputtering to investigate the effects of oxygen-argon gas ratio and sputtering power on the rectification curves of the heterojunction.Use COMSOL simulation to analyze the structure,resonance frequency,voltage power versus frequency and voltage power versus load of the piezoelectric module;Use SCAPS-1D simulation to analyze the effect of Cu₂O film thickness,light intensity and operating temperature on the performance of the optoelectronic module and analyze its I-V characteristic curve.A test system was built for piezoelectric test,photoelectric test and composite test,and compared with a single module.The results show that the composite energy harvester can effectively improve the output performance and can broaden the use of energy harvesting.