12 JEJU NATIONAL UNIVERSITY PIEZO-PHOTOTRONIC SYSTEMS The piezo-phototronic effect has been a promising approach to modulate the optoelectronic properties for potential applications in flexible smart electronics. Tuning the inner piezoelectric potentials in multifunctional micro and nanomaterials improves the responsivity of optical detection upon the applied strain. With the three-way coupling effect, we construct the selfpowered photodetectors to cultivate bias-free and independent sensing devices and systems. 04
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