Flexible and transparent piezoelectric loudspeaker

The simple structure of flexible piezoelectric polymers implies promise innumerous applications,such as transparent loudspeakers.In this study,we fabricated and characterized a prototype loudspeaker device.The loudspeaker was fabricated using a straightforward method of sandwiching a film of copolymer blend between a pair of flexible ITO substrates,which served as top and bottom electrodes.The dependence of acoustic properties of the devices was investigated in accordance with d_(33)and piezoresponse force microscopy(PFM).In this study,we examine the sound pressure level(SPL)and sound intensity(SI)of devices featuring 0.5≤α≤0.9 blends,with an active area of 6.5 cm×5 cm at 100 Vpp applied voltage.Here we report SPL of 96 dB and SI of 3.98mWm^(−2)for anα=0.7 blend at 100 Vpp.Our results are helpful in developing flexible,transparent piezoelectric polymers and in the development of lightweight,transparent loudspeaker devices.