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MM: Fachverband Metall- und Materialphysik
MM 24: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 24.2: Vortrag
Mittwoch, 3. April 2019, 10:45–11:00, H45
Correlation of conductivity and failure mechanism of silver nanowire networks: a scale bridging in situ study — •Nadine Schrenker1, Peter Schweizer1, Marco Moninger1, George D. Spyropoulos1, Mirza Mačković1, Manuela Göbelt2, Nikolas Karpstein1, Silke Christiansen2, Christoph J. Brabec1, and Erdmann Spiecker1 — 1FAU Erlangen, Germany — 2MPI, Erlangen
For flexible organic solar cells it is decisive to withstand mechanical loading without sacrificing the performance. Silver nanowire (Ag NW) networks are a highly promising electrode material, since they combine a low sheet resistance with a high transmittance, however the interplay between microscopic failure mechanisms and the functional properties of electrodes in complete OSCs has not been elucidated so far. In this work we introduce a scale-bridging in situ approach to correlate the mechanical response of Ag NW electrodes with their electrical properties starting from single wires up to complete solar cell devices. On the nanometer scale in situ STEM tensile tests of single 5-fold twinned Ag NWs reveal a localized deformation by necking and a clear size-dependence of the mechanical properties. Going up in scale, Ag NW networks on PET foils were tested by in operado SEM tensile tests. These tests show a clear dependency of the wire orientation regarding the straining direction. Buckling as well as kinking as deformation mechanism were observed for wires perpendicular to the straining direction. Moreover, the texture can be utilized to increase the conductivity at 20 % up to nine times. The phenome of kinking is analyzed via HRTEM and complementary atomistic simulation.