A game changer : a multifunctional perovskite exhibiting giant ferroelectricity and narrow bandgap with potential application in a truly monolithic multienergy harvester or sensor
Bai, Yang; Tofel, Pavel; Palosaari, Jaakko; Jantunen, Heli; Juuti, Jari (2017-06-06)
Y. Bai, P. Tofel, J. Palosaari, H. Jantunen, J. Juuti, A game changer : A multifunctional perovskite exhibiting giant ferroelectricity and narrow bandgap with potential application in a truly monolithic multienergy harvester or sensor. Adv. Mater. 2017, 1700767. DOI: 10.1002/adma.201700767
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Y. Bai, P. Tofel, J. Palosaari, H. Jantunen, J. Juuti, Adv. Mater. 2017, 29, 1700767. https://doi.org/10.1002/adma.201700767, which has been published in final form at https://doi.org/10.1002/adma.201700767. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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.
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