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Mesoporous TiO2 hierarchical structures: preparation and efficacy in solar cells

Title
Mesoporous TiO2 hierarchical structures: preparation and efficacy in solar cells
Authors
Hwang, Dae KueKim, Jeong HwaKim, Kang PilSung, Shi Joon
DGIST Authors
Hwang, Dae KueKim, Kang Pil; Sung, Shi Joon
Issue Date
2017
Citation
RSC Advances, 7(77), 49057-49065
Type
Article
Article Type
Article
Keywords
ENERGY-CONVERSION-EFFICIENCYNANOCRYSTALLINE TIO2BLOCKING LAYERSNANOSTRUCTURED PARTICLESSCATTERING LAYERSFILMSPERFORMANCEPHOTOANODEENHANCEMENTELECTRODES
ISSN
2046-2069
Abstract
We investigated an electrospray-based method to manufacture photoelectrodes for dye-sensitized solar cells (DSSCs). TiO2 doughnut-, spherical-, and disk-shaped particles with a large surface area, high crystallinity, uniform nanostructure, and good light scattering properties were fabricated via a simple electrospray method. The control of the morphology of the nanostructured particles prepared by electrospraying a dispersion of nanoparticles was investigated experimentally; the results are qualitatively explained on the basis of the available theory. The solvent in the droplet, droplet size, surface tension, process temperature, and process humidity are crucial to the morphology of the resulting particles. The effect of the particle morphology on the performance of DSSCs is demonstrated. Compared to the DSSCs with conventional photoelectrodes (with a power conversion efficiency of 8.4%), the DSSCs based on doughnut-, spherical-, and disk-shaped particle photoelectrodes yielded higher power conversion efficiencies of 8.8%, 9.3%, and 10.4%, respectively. The DSSC utilizing the disk-type photoelectrode showed the best performance under AM1.5 global illumination through a photo-mask at an illumination power of 100 mW cm-2. This is because the generated TiO2 disks provide a large surface area and exhibit excellent light scattering capabilities, thus resulting in a low total internal resistance and long electron lifetime. © 2017 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/5665
DOI
10.1039/c7ra09425f
Publisher
ROYAL SOC CHEMISTRY
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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