Chair News

Two new PhD students joined the Chair for Organic Devices

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Welcome to Katherina Haase and Jakob Zessin the new PhD students at the Chair for Organic Devices. We are very glad to have them on board!

 

Combing Polymers for Better Organic Solar Cell (pub. in 'Nature Communications')

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Combing polymers for better organic solar cells

After we previously demonstrated, that controlling the ink-flow with our FLUENCE technique leads to massive improvements in the film structure and performance for small organic semiconductor inks, a new paper, published in Nature Communications, describes our modification of the FLUENCE approach to work with conjugated semiconducting polymers.
The question here was: can we achieve similar control over the morphology of polymer films as we achieved for the small molecules. The answer is yes, but in order to work for polymers, the structures controlling the ink flow needed to be shrunk from tens of micrometers down to as small as possible. New shearing blades with photo-lithographic structured pillars of 1-2 micrometer diameter and pitch were produced. These specially structured blades improved the morphology of printed polymer films for organic solar cells and enhanced all metrics of solar cell device performance across various printing conditions, specifically leading to higher short-circuit current, fill factor, open circuit voltage and significantly reduced device-to-device variation.

"Nano grass" for organic photovoltaic devices

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Follow some coverage that the research on “Nano grass” for organic photovoltaic devices recently received. This work is the result of a collaboration with Prof. Briseno, UMass, USA.

nano grass

http://www.materialstoday.com/energy/news/nanoscopic-grass-stacks-like-coins-for-solar-power