Experimental and theoretical study of phase separation in ZnPc:C60 blends
| Autor: | Tejas S. Sherkar, Peter Formanek, Christian Koerner, Pascal Friederich, Karl Leo, Wolfgang Wenzel, Koen Vandewalg, L. Jan Anton Koster, Tobias Mönch, Moritz Riede |
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| Přispěvatelé: | Molecular Energy Materials, Photophysics and OptoElectronics |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Organic solar cell business.industry Photoconductivity Energy conversion efficiency Analytical chemistry General Chemistry Conductive atomic force microscopy Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Biomaterials Transmission electron microscopy Materials Chemistry Optoelectronics Density functional theory Electrical and Electronic Engineering business Layer (electronics) |
| Zdroj: | Organic Electronics, 27. ELSEVIER SCIENCE BV |
| ISSN: | 1566-1199 |
| Popis: | Understanding the relationship between the absorber layer microstructure and the power conversion efficiency is of paramount importance to further improve the efficiency of organic solar cells. Utilizing transmission electron microscopy (TEM), (photo-)conductive atomic force microscopy ((p)cAFM), 3D drift-diffusion simulations, and density functional theory, we reveal the microscopic origins of phase-separation in a blend of zinc phthalocyanine (ZnPc) and C 60 , used as an absorber layer in organic solar cells. By means of (p)cAFM, we observe photoconductive, circular structures at the surface, which are identified as α -ZnPc islands. Moreover, in agreement with TEM investigations, we observe photoconductive, nanorod-like structures close to the surface which we assign to β -ZnPc. Finally, we apply a 3D drift-diffusion simulation based on the morphology determined by TEM to provide a link between the different contrasts observed in pcAFM and TEM. |
| Databáze: | OpenAIRE |
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