Electronic band structures and photovoltaic properties of MWO{sub 4} (M=Zn, Mg, Ca, Sr) compounds

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.06.005· OSTI ID:21580227

Cho, In-Sun ^[1]; Shin, Seong Sik ^[2]; Lee, Sangwook ^[2]; Noh, Tae Hoon; Kim, Dong Hoe ^[2]; Jung, Hyun Suk ^[3]

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1. Department of Mechanical Engineering, Stanford University, Stanford, California 94305 (United States)
2. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of)
3. School of Advanced Materials Engineering, Kookmin University, Seoul 136-702 (Korea, Republic of)

Divalent metal tungstates, MWO{sub 4}, with wolframite (M=Zn and Mg) and scheelite (M=Ca and Sr) structures were prepared using a conventional solid state reaction method. Their electronic band structures were investigated by a combination of electronic band structure calculations and electrochemical measurements. From these investigations, it was found that the band structures (i.e. band positions and band gaps) of the divalent metal tungstates were significantly influenced by their crystal structural environments, such as the W-O bond length. Their photovoltaic properties were evaluated by applying to the working electrodes for dye-sensitized solar cells. The dye-sensitized solar cells employing the wolframite-structured metal tungstates (ZnWO{sub 4} and MgWO{sub 4}) exhibited better performance than those using the scheelite-structured metal tungstates (CaWO{sub 4} and SrWO{sub 4}), which was attributed to their enhanced electron transfer resulting from their appropriate band positions. - Graphical abstract: The electronic band structures of divalent metal tungstates are described from the combination of experimental results and theoretical calculations, and their electronic structure-dependent photovoltaic performances are also studied. Highlights: > MWO{sub 4} compounds with wolframite (M=Zn and Mg) and scheelite structure (M=Ca and Sr) were prepared. > Their electronic band structures were investigated by the calculations and the measurements. > Their photovoltaic properties were determined by the crystal and electronic structures.

• OSTI ID: 21580227
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 8; Other Information: DOI: 10.1016/j.jssc.2011.06.005; PII: S0022-4596(11)00316-1; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM TUNGSTATES
CRYSTALS
DYES
ELECTRON TRANSFER
ELECTRONIC STRUCTURE
METALS
PHOTOVOLTAIC EFFECT
SOLAR CELLS
STRONTIUM TUNGSTATES
WOLFRAMITE
ZINC TUNGSTATES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
INORGANIC PHOSPHORS
MINERALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PHOSPHORS
PHOTOELECTRIC CELLS
PHOTOELECTRIC EFFECT
PHOTOVOLTAIC CELLS
REFRACTORY METAL COMPOUNDS
SOLAR EQUIPMENT
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS
ZINC COMPOUNDS