Origin of high piezoelectricity of inorganic halide perovskite thin films and their electromechanical energy-harvesting and physiological current-sensing characteristics

Abstract

This work reports the origin of high piezoelectricity of inorganic halide thin films poled at high fields along with the electromechanical energy-harvesting and motion-sensing performance.

High‐Resolution In‐Situ Synchrotron X‐Ray Studies of Inorganic Perovskite CsPbBr3: New Symmetry Assignments and Structural Phase Transitions

“…[ 21 ] A significant piezoelectric response has been found in films of this material (≈40 nm to ≈260 nm thick). [ 22 ] Room temperature remnant polarization values up to ≈0.03 µC cm − 2 were observed. These recent studies suggest the existence of non‐centrosymmetric structures and new symmetry assignments in bulk CsPbBr 3 at room temperature and below.…”

Organolead halide perovskites beyond solar cells: self-powered devices and the associated progress and challenges

“…Flexible pressure sensors have numerous applications in areas such as artificial electronic skins 145,151,152 , health monitoring devices [153][154][155][156] , soft robotics [157][158][159] , and wearable technology. [160][161][162][163][164][165] It also improves the seamless interfacing of such devices with the environment to act as a medium for information collection to drive robotics and human-artificial intelligence interactions.…”

“…Today, there is an increasing need for portable self-powered gas sensing devices to monitor personal health, toxic gas release, and safety in public space. 141,154,[171][172][173][174][175][176] undergo interaction with the amine cation of FMCPIB. Such interaction was attributed to reducing the defects in the perovskite film which decreases the charge recombination and hence increasing the density of free charge carriers.…”

Recent advances in hybrid perovskite nanogenerators

“…70 Lately, CsPbBr 3 polycrystalline films were employed as piezoelectric materials in PENGs for electromechanical energy-harvesting and current-sensing applications. 71 The morphology of CsPbBr 3 films was initially optimized with the processing parameters, and a highly effective piezoelectric coefficient of 40.3 pm/V was recorded at a subsequent poling field. The high piezoelectricity was pursued on the origin of structural distortion that the bonding angles of Pb Br Pb and Br Pb Pb were extended along the b-axis and in the ac-plane of the perovskite structure.…”

“…The piezoelectric polarization effect has been demonstrated in CsPbBr 3 nanowires which can induce refractive index change and enable dynamic modulation of lasing modes 70 . Lately, CsPbBr 3 polycrystalline films were employed as piezoelectric materials in PENGs for electromechanical energy‐harvesting and current‐sensing applications 71 . The morphology of CsPbBr 3 films was initially optimized with the processing parameters, and a highly effective piezoelectric coefficient of 40.3 pm/V was recorded at a subsequent poling field.…”