In her efforts to understand the mechanisms that underpin device operation in OFETs, OLEDs and OPVs, Walker uses optical models that solve Maxwell's equations. These equations can be used to understand the variations in fields associated with photon absorption and generation. Such models can be used to understand the luminance, quantum efficiencies and current-voltage characteristics. A combination of the three models can be used to identify and optimize the positions of the dissociation and recombination zones. In 2013 Walker was made Academic Director of the Centre for Doctoral Training in New and Sustainable Photovoltaics, as well as co-leading the University of Bath SuperSolar network.