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C7.03 - Efficiency Enhancement of Organic Photovoltaics by Incorporation of Interfacial Layers 
April 23, 2014   9:15am - 9:30am

Organic photovoltaics have been emerging as interesting candidates for sustainable energy. Especially appealing to this technology are desirable properties such as simple preparation, novel aesthetical possibilities, semi-transparency, reduced weight and mechanical flexibility, and better performance in diffuse light conditions. The main focus in the field of polymer-based solar cells has always been on improving photovoltaic performance. To achieve high power conversion efficiencies, a plethora of new photoactive donor polymers and fullerene derivatives have been developed and blended in bulk heterojunction active layers. Nonetheless, further optimization of the device architecture is also of major importance. In previous work, we have shown that the introduction of an imidazolium-substituted conjugated polyelectrolyte between the active layer and the top electrode resulted in a significant enhancement of the I-V properties of polymer solar cell devices, resulting in a considerable gain in overall photovoltaic output.[1] In the presented work, we report on a wide range of ionic (block co)polymer materials as possible candidates for (n-type) interfacial layers, exceeding the previously reported power conversion efficiencies. Through the use of various characterization techniques, deeper fundamental insights are conceived on the working principles of these interlayers.[1] Kesters J.; Ghoos T.; Penxten H.; Drijkoningen J.; Vangerven T.; Lyons D.M.; Verreet B.; Aernouts T.; Lutsen L.; Vanderzande D.; Manca J.; Maes W., Adv. Energy Mater., 2013, 9, 1180.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis