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Electrically percolating nanowire networks are amongst the most promisingcandidates for next-generation transparent electrodes. Scientific interest inthese materials stems from their intrinsic current distribution heterogeneity,leading to phenomena like percolating pathway re-routing and localizedself-heating, which can cause irreversible damage. Without an experimentaltechnique to resolve the current distribution, and an underpinning nonlinearpercolation model, one relies on empirical rules and safety factors to engineerthese materials. We introduce Bose-Einstein microscopy to address thelong-standing problem of imaging active current flow in 2D materials. We reporton improvement of the performance of this technique, whereby observation ofdynamic redistribution of current pathways becomes feasible. We show how this,combined with existing thermal imaging methods, eliminates the need forassumptions between electrical and thermal properties. This will enable testingand modelling individual junction behaviour and hotspot formation.Investigating both reversible and irreversible mechanisms will contribute tothe advancement of devices with improved performance and reliability.

Quantum gas-enabled direct mapping of active current density in percolating networks of nanowires