Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 99, Issue -, Pages 50-55Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2011.03.034
Keywords
Electrochromic window; Ultrasonic spray deposition; Low-cost processing; Tungsten oxide; Nanomaterials
Funding
- National Science Foundation through the Renewable Energy Materials Research Science and Engineering Center [DMR-0820518]
- Department of Energy through the DOE Office of Energy Efficiency and Renewable Energy, Office of Building Technologies Program [DE-AC36-08G028308]
- Science Foundation Ireland through an ETS
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0820518] Funding Source: National Science Foundation
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Crystalline tungsten oxide nanoparticles (NPs) were synthesized by hot-wire chemical vapor deposition (HWCVD) and subsequently employed to form electrochromic thin films using ultrasonic spray deposition. Particle morphology may be tuned using HWCVD synthesis parameters including filament temperature, substrate temperature, and oxygen partial pressure. The electrochromic performance of films derived from three sets of NPs was characterized by performing cyclic voltammetry in direct registry with measurements of optical transmission. The coloration efficiency scaled with the specific surface area, and values obtained from films derived from HWCVD NPs were as high as 38 cm(2)/C, comparing favorably with leading WO3 films produced by sputtering. The HWCVD-based material formed continuous films that were mesoporous in nature, while the larger commercial NPs did not form homogeneous coatings. In addition to size, XRD and Raman analysis revealed a correlation between performance and the presence of the epsilon-monoclinic crystal phase. (C) 2011 Elsevier B.V. All rights reserved.
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