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The realization of a complete tandem polymer solar cell under ambient conditions using only printing and coating methods on a flexible substrate results in a fully scalable process but also requires accurate control during layer formation to succeed. The serial process where the layers are added one after the other by wet processing leaves plenty of room for error and the process development calls for an analytical technique that enables 3D reconstruction of the layer stack with the possibility to probe thickness, density, and chemistry of the individual layers in the stack. The use of ptychography on a complete 12-layer solar cell stack is presented and it is shown that this technique provides the necessary insight to enable efficient development of inks and processes for the most critical layers in the tandem stack such as the recombination layer where solvent penetration in fully solution processed 12-layer stacks is critical in eleven of the steps. [ABSTRACT FROM AUTHOR]

Jens W. Andreasen and co‐workers identify and surmount the challenges of fast and scalable manufacture of polymer tandem solar cells as reported in article number 1400736. This is accomplished by combining in situ X‐ray scattering and the high resolution 3D X‐ray vision provided by coherent synchrotron radiation diffractive imaging. [ABSTRACT FROM AUTHOR]