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Unusually High Optical Transmission in Ca:Ag Blend Films: High-Performance Top Electrodes for Efficient Organic Solar Cells.
- Source :
-
Advanced Functional Materials . Nov2014, Vol. 24 Issue 42, p6668-6676. 9p. - Publication Year :
- 2014
-
Abstract
- Highly transparent electrodes are demonstrated based on thermally evaporated calcium:silver blend thin-films, which show unusually high transmission well above the expectations from bulk material properties and thin film optics. These electrodes exhibit a low sheet resistance of 27.3 Ω/, combined with an extraordinarily high mean transmittance of 93.0% in the visible spectral range (σdc/σopt = 186.7), superior to the commonly used inorganic electrodes made from indium tin oxide (ITO). Additionally, the metal blend electrode is flexible, showing a constant sheet resistance down to a bending radius of 10 mm and can be employed on top of organic devices without causing damage to the organic material. The spontaneously formed unique microstructure of a polycrystalline Ag network with randomly distributed nanoapertures, surrounded by a calcium shell, enables broadband transmittance enhancement due to amplified plasmonic coupling. Consequently, top-illuminated organic solar cells using such metal blend electrodes achieve a power conversion efficiency of 7.2% (which defines a new record for top illuminated organic solar cells) and even exceed the efficiency of similar bottom-illuminated reference solar cells (6.9%) employing common ITO electrodes. [ABSTRACT FROM AUTHOR]
- Subjects :
- *THIN films
*LIGHT transmission
*ELECTRODES
*TRANSMITTANCE (Physics)
*SOLAR cells
Subjects
Details
- Language :
- English
- ISSN :
- 1616301X
- Volume :
- 24
- Issue :
- 42
- Database :
- Academic Search Index
- Journal :
- Advanced Functional Materials
- Publication Type :
- Academic Journal
- Accession number :
- 99322290
- Full Text :
- https://doi.org/10.1002/adfm.201401854