3 years ago

A Game Changer: A Multifunctional Perovskite Exhibiting Giant Ferroelectricity and Narrow Bandgap with Potential Application in a Truly Monolithic Multienergy Harvester or Sensor

A Game Changer: A Multifunctional Perovskite Exhibiting Giant Ferroelectricity and Narrow Bandgap with Potential Application in a Truly Monolithic Multienergy Harvester or Sensor
Pavel Tofel, Jari Juuti, Yang Bai, Jaakko Palosaari, Heli Jantunen
An ABO3-type perovskite solid-solution, (K0.5Na0.5)NbO3 (KNN) doped with 2 mol% Ba(Ni0.5Nb0.5)O3−δ (BNNO) is reported. Such a composition yields a much narrower bandgap (≈1.6 eV) compared to the parental composition—pure KNN—and other widely used piezoelectric and pyroelectric materials (e.g., Pb(Zr,Ti)O3, BaTiO3). Meanwhile, it exhibits the same large piezoelectric coefficient as that of KNN (≈100 pC N−1) and a much larger pyroelectric coefficient (≈130 µC m−2 K−1) compared to the previously reported narrow-bandgap material (KNbO3)1−x-BNNOx. The unique combination of these excellent ferroelectric and optical properties opens the door to the development of multisource energy harvesting or multifunctional sensing devices for the simultaneous and efficient conversion of solar, thermal, and kinetic energies into electricity in a single material. Individual and comprehensive characterizations of the optical, ferroelectric, piezoelectric, pyroelectric, and photovoltaic properties are investigated with single and coexisting energy sources. No degrading interaction between ferroelectric and photovoltaic behaviors is observed. This composition may fundamentally change the working principles of state-of-the-art hybrid energy harvesters and sensors, and thus significantly increases the unit-volume energy conversion efficiency and reliability of energy harvesters in ambient environments. A multifunctional perovskite composition exhibiting giant ferroelectricity and narrow bandgap is reported. Ceramics and thick-films are fabricated via solid-state reaction and laser machining, respectively. Their balanced piezoelectric, pyroelectric, and photovoltaic properties and the multitask feature pave the way to the development of all-in-one multisource energy harvesting and multifunctional sensing devices based on the simplest solution of materials and structures.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700767

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