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Piezoelectric energy harvester scavenges mechanical vibrations and generateselectricity. Researchers have strived to optimize the electromechanicalstructures and to design necessary external power management circuits, aimingto deliver high power and rectified outputs ready for serving as batteries.Complex deformation of the mechanical structure results in charges withopposite polarities appearing on same surface, leading to current loss in theattached metal electrode. External power management circuits such as rectifierscomprise diodes that consume power and have undesirable forward bias. Toaddress the above issues, we devise a novel integrated piezoelectric energyharvesting device that is structured by stacking a layer of quantum dots (QDs)and a layer of piezoelectric material. We find that the QD can rectifyelectrical charges generated from the piezoelectric material because of itsadaptable conductance to the electrochemical potentials of both sides of theQDs layer, so that electrical current causing energy loss on the same surfaceof the piezoelectric material can be minimized. The QDs layer has the potentialto replace external rectification circuits providing a much more compact andless power-consumption solution.

Rectifying the output of vibrational piezoelectric energy harvester using quantum dots