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Cover Picture: It is all in the Pattern—High-Efficiency Power Extraction from Polymer Solar Cells through High-Voltage Serial Connection (Energy Technol. 1/2013)
Polymer Solar Cells—A Nearly Infinite Series: The cover image demonstrates a series connection of polymer solar cells of effectively infinite length. Solar cells made of polymeric materials currently suffer from lower efficiencies than their competing technologies in the form of inorganic materials such as silicon. However, organic solar cells do have a number of unique advantages in the low consumption of inexpensive materials and ease of processing and installation, partly owing to the polymeric material's inherent mechanical flexibility. The Communication by Frederik Krebs and colleagues at the Danish Technical University on page 15 demonstrates that roll-to-roll processing of indium-tin-oxide-free polymeric solar cells can be performed at a very high yield, allowing for a nearly infinite serial connection. These solar cell arrays show an increased robustness towards individual defective cells, which is a newly demonstrated advantage over their inorganic counterparts.