Alternating Copolymers and Alternative Device Geometries for Organic Photovoltaics
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The efficiency of conversion of light to electrical energy with the help of conjugated polymers and molecules is rapidly improving. The optical absorption properties of these materials can be designed, and implemented via molecular engineering. Full coverage of the solar spectrum is thus feasible. Narrow absorption spectra allow construction of tandem solar cells. The poor transport properties of these materials require thin devices, which limits optical absorption. Alternative device geometries for these flexible materials compensate for the optical absorption by light trapping, and allow tandem cells.
KeywordsPhotovoltaic energy conversion Bulk heterojunctions Polymer solar cell Organic photovoltaics
The study summarized here has been performed by a great number of students, postdocs, and guest scientists within the Center of Organic Electronics (COE), financed by the Strategic Research Foundation of Sweden, and more recently by the Swedish Energy Agency. Stefan Hellström, Viktor Andersson, and Kristofer Tvingstedt prepared figures.
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