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27 Feb 2012

Volume 100, Issue 9, Articles (09xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 093101 (2012); http://dx.doi.org/10.1063/1.3687190 (4 pages)

Jinhai Mao, Li Huang, Yi Pan, Min Gao, Junfeng He, Haitao Zhou, Haiming Guo, Yuan Tian, Qiang Zou, Lizhi Zhang, Haigang Zhang, Yeliang Wang, Shixuan Du, Xingjiang Zhou, A. H. Castro Neto, et al.
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Is it effective to harvest visible light by decreasing the band gap of photocatalytic materials?

Ning Fu, Xinhu Tang, and Dongyang Li

Appl. Phys. Lett. 100, 093901 (2012); http://dx.doi.org/10.1063/1.3690052 (4 pages) | Cited 1 time

Online Publication Date: 1 March 2012

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In situ variations in the electron work function and photo-current of TiO2 nanotubes demonstrate that long-wavelength illumination only has a minor effect on the excitation of electrons in the nanotubes after being exposed to short-wavelength light or when the short-wavelength light coexisted, indicating that the solar spectrum may not be utilized as efficiently as expected by extending the absorption spectrum of the photocatalytic material to visible light range with decreased band gaps.
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72.40.+w Photoconduction and photovoltaic effects
73.22.-f Electronic structure of nanoscale materials and related systems
73.30.+y Surface double layers, Schottky barriers, and work functions
78.40.Fy Semiconductors
82.50.Hp Processes caused by visible and UV light
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Band-filling dependence of thermoelectric properties in B20-type CoGe

N. Kanazawa, Y. Onose, Y. Shiomi, S. Ishiwata, and Y. Tokura

Appl. Phys. Lett. 100, 093902 (2012); http://dx.doi.org/10.1063/1.3691260 (3 pages)

Online Publication Date: 2 March 2012

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We have synthesized B20-type Co1−xFexGe and Co1−yNiyGe by a high-pressure method and investigated the band-filling dependence of thermoelectric properties. CoGe shows a large figure of merit (ZT ≈ 0.11) due to its low resistivity and large negative Seebeck coefficient (S) (-82μV/K) at 300 K. The sign-crossover of S is observed with increasing Fe concentration. The Boltzmann transport model can explain semi-quantitatively the experimental results, from which we conclude that the large positive or negative S originates from the asymmetric band structure composed of the Dirac cone and the flat band with sharp bends around the Fermi energy.
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72.20.Pa Thermoelectric and thermomagnetic effects
82.40.Fp Shock wave initiated reactions, high-pressure chemistry
62.50.-p High-pressure effects in solids and liquids
72.20.-i Conductivity phenomena in semiconductors and insulators
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