期刊
ADVANCED MATERIALS
卷 29, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700767
关键词
multisource energy harvesting; photovoltaics; piezoelectrics; pyroelectrics
类别
资金
- European Union [705437]
- Academy of Finland [267573, 273663, 298409]
- Ministry of Education, Youth and Sports of the Czech Republic [CEITEC 2020 (LQ1601)]
- Academy of Finland (AKA) [298409, 298409] Funding Source: Academy of Finland (AKA)
- Marie Curie Actions (MSCA) [705437] Funding Source: Marie Curie Actions (MSCA)
An ABO(3)-type perovskite solid-solution, (K0.5Na0.5)NbO3 (KNN) doped with 2 mol% Ba(Ni0.5Nb0.5)O3-delta (BNNO) is reported. Such a composition yields a much narrower bandgap (approximate to 1.6 eV) compared to the parental composition-pure KNN-and other widely used piezoelectric and pyroelectric materials (e.g., Pb(Zr,Ti)O-3, BaTiO3). Meanwhile, it exhibits the same large piezoelectric coefficient as that of KNN (approximate to 100 pC N-1) and a much larger pyroelectric coefficient (approximate to 130 mu C 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 photo-voltaic 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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