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28 Jan 2013

Volume 102, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 102, 041101 (2013); http://dx.doi.org/10.1063/1.4777564 (5 pages)

K. Winkler, C. Schneider, J. Fischer, A. Rahimi-Iman, M. Amthor, A. Forchel, S. Reitzenstein, S. Höfling, and M. Kamp
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Micro-fabricated lead zirconate titanate bent cantilever energy harvester with multi-dimensional operation

J. C. Park, S. Khym, and J. Y. Park

Appl. Phys. Lett. 102, 043901 (2013); http://dx.doi.org/10.1063/1.4789754 (4 pages)

Online Publication Date: 28 January 2013

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At present, a cantilever with an inertial mass at its free end is the most widely used form for a vibration-based energy harvester, due to its simple structure and fabrication. However, the one-dimensional operation limits device installation. We first report a multi-dimensional piezoelectric cantilever-type energy harvester that oscillates not only in the vertical direction but also in the radial direction. While the conventional cantilever-type energy harvester maintains almost its maximum output power when it is installed within 20° of the operating direction, the proposed device presents the significantly improved result that the output power is independent of the installation angle.
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07.10.Cm Micromechanical devices and systems
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
84.60.-h Direct energy conversion and storage

Photoferroelectric solar to electrical conversion

Miloš Knežević and Mark Warner

Appl. Phys. Lett. 102, 043902 (2013); http://dx.doi.org/10.1063/1.4789907 (4 pages)

Online Publication Date: 29 January 2013

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We propose a charge pump which converts solar energy into dc electricity. It is based on cyclic changes in the spontaneous electric polarization of a photoferroelectric material, which allows a transfer of charge from a low to a high voltage. To estimate the power efficiency we use a photoferroelectric liquid crystal as the working substance. For a specific choice of material, an efficiency of 2% is obtained.
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88.40.-j Solar energy
72.40.+w Photoconduction and photovoltaic effects
77.80.-e Ferroelectricity and antiferroelectricity
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