A round robin, where several laboratories study the same solar cells in a sequential manner, is a fast and powerful method that enables the validation of performance parameters and the establishment of their spread. Flexible and ITO-free polymer solar cells characterized in this manner present a spread in recorded parameters with a standard error of 5–25% where degradation is eliminated. This underlines the need for the general use of such techniques.

Hybrid field-effect-transistors (FETs) with germanium nanowire (NW) arrays and organic gate dielectric are presented. The nanowire deposition steps are fully compatible with printed electronics route. NW FETs demonstrate good performance with On/Off ratios of ~103 and hole mobilities of ~13 cm2/Vs in both nitrogen and air atmosphere. These results suggest that the hybrid nanowire FETs could be used in large area inexpensive electronics.