Journal
SOLAR ENERGY
Volume 103, Issue -, Pages 480-487Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2014.02.046
Keywords
Intermediate band; Ti-substituted CuGaS2; Solvothermal method
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Funding
- National Nature Science Foundation [51102203, 51172191, 51202208]
- National Basic Research Program of China [2012CB921303]
- Open Fund based on the innovation platform of Hunan colleges and universities [11K061]
- Hunan Provincial Natural Science Foundation of China [10JJ2003]
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Intermediate band solar cells (IBSC) have been proposed in order to substantially increase the efficiency of solar cells. A novel intermediate band (TB) photovoltaic material of Ti-substituted CuGaS2 (Ti-CGS(2)) has been successfully fabricated via a facile solvothermal method. By part substitution of Ga atoms with Ti in the CGS(2) chalcopyrite crystal, a narrow partially filled TB was introduced and two additional absorption bands at 710 nm (IB -> CBM, 1.75 eV) and 1350 nm (VBM -> IB, 0.92 eV) were directly observed in the UV-vis-NIR spectrum. Element Ti, acting as trivalent substituents confirmed by the X-ray photoelectron spectroscopy (XPS), forms an TB from the lowest subshell of its 3d levels. Photoelectrochemical investigations of the Ti-CGS(2) verified the wide-spectrum solar response from the TB effect. This material leads to lower-energy photon absorption, which could be a promising candidate for the high-efficiency solar cells. (C) 2014 Elsevier Ltd. All rights reserved.
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