NETWORKS OF NANOPARTICLES IN ORGANIC – INORGANIC COMPOSITES: ALGORITHMIC EXTRACTION AND STATISTICAL ANALYSIS
| Autor: | Volker Schmidt, Thomas Zeibig, Neil C. Greenham, James C. Hindson, Zineb Saghi, Paul A. Midgley, Aaron Spettl, Ralf Thiedmann, Ole Stenzel |
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| Rok vydání: | 2012 |
| Předmět: |
Nanostructure
Materials science Acoustics and Ultrasonics Silicon Materials Science (miscellaneous) General Mathematics chemistry.chemical_element Nanoparticle Composite Material Iterative Thresholding 3D Imaging Polymer solar cell Hough transform law.invention law Charge Transport Radiology Nuclear Medicine and imaging Composite material Instrumentation Hough Transform lcsh:R5-920 business.industry 3D Watershed lcsh:Mathematics lcsh:QA1-939 Renewable energy Nanoparticle System chemistry Electron tomography Percolation Signal Processing Network Morphology Computer Vision and Pattern Recognition lcsh:Medicine (General) business Electron Tomography Biotechnology |
| Zdroj: | Image Analysis and Stereology, Vol 31, Iss 1, Pp 27-42 (2012) |
| ISSN: | 1854-5165 1580-3139 |
| DOI: | 10.5566/ias.v31.p27-42 |
| Popis: | The rising global demand in energy and the limited resources in fossil fuels require new technologies in renewable energies like solar cells. Silicon solar cells offer a good efficiency but suffer from high production costs. A promising alternative are polymer solar cells, due to potentially low production costs and high flexibility of the panels. In this paper, the nanostructure of organic–inorganic composites is investigated, which can be used as photoactive layers in hybrid–polymer solar cells. These materials consist of a polymeric (OC1C10-PPV) phase with CdSe nanoparticles embedded therein. On the basis of 3D image data with high spatial resolution, gained by electron tomography, an algorithm is developed to automatically extract the CdSe nanoparticles from grayscale images, where we assume them as spheres. The algorithm is based on a modified version of the Hough transform, where a watershed algorithm is used to separate the image data into basins such that each basin contains exactly one nanoparticle. After their extraction, neighboring nanoparticles are connected to form a 3D network that is related to the transport of electrons in polymer solar cells. A detailed statistical analysis of the CdSe network morphology is accomplished, which allows deeper insight into the hopping percolation pathways of electrons. |
| Databáze: | OpenAIRE |
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