| 1. |
- Dal Zilio, Simone, et al.
(författare)
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Fabrication of a light trapping system for organic solar cells
- 2009
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Ingår i: MICROELECTRONIC ENGINEERING. - : Elsevier BV. - 0167-9317. ; 86:4-6, s. 1150-1154
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Tidskriftsartikel (refereegranskat)abstract
- Organic photovoltaic cells (OPV) are among the most promising systems for energy extraction and conversion from renewable energy sources. However, major problem to be solved before industrial production could become economically viable is represented by their still low conversion efficiency. The organic solar cell architectures are presently the result of a compromise between achieving complete light absorption using active layers that are thicker than the optical absorption length and achieving efficient charge collection at the electrodes which is favoured in thinner layers. We present a concept and its experimental demonstration that would solve efficiently the above trade-off problem by making use of a new type of light trapping elements. The simple fabrication scheme, based on a self-aligned UV exposure process, suggests its potential up-scalability to large systems, at low production cost.
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| 2. |
- Tvingstedt, Kristofer, 1976-, et al.
(författare)
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Light Confinement in Thin Film Organic Photovoltaic cells
- 2006
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Ingår i: Photonics Europe, Strasbourg. - : SPIE.
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Konferensbidrag (refereegranskat)abstract
- Microstructuring of polymer surfaces on optical spacers allows formation of reflective light traps. Such flexible reflectors can be combined with flexible polymer solar cells. We have demonstrated enhanced absorption using Lambertian and regular light reflectors, demonstrated via luminescence from fluorescent layers. Such light traps are suitable to use in combination with polymer solar cells incorporating transparent electrodes. The possibility to enhance the concentration of excited states and photogenerated charges through light trapping also helps to increase charge carrier mobility. These experimental results indicate that light confinement may be an alternative approach for boosting the efficiency of thin film conjugated polymer photovoltaics.
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| 3. |
- Tvingstedt, Kristofer, et al.
(författare)
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Trapping light with micro lenses in thin film organic photovoltaic cells
- 2008
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Ingår i: Optics Express. - 1094-4087. ; 16:26, s. 21608-21615
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate a novel light trapping configuration based on an array of micro lenses in conjunction with a self aligned array of micro apertures located in a highly reflecting mirror. When locating the light trapping element, that displays strong directional asymmetric transmission, in front of thin film organic photovoltaic cells, an increase in cell absorption is obtained. By recycling reflected photons that otherwise would be lost, thinner films with more beneficial electrical properties can effectively be deployed. The light trapping element enhances the absorption rate of the solar cell and increases the photocurrent by as much as 25%.
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