Walker has developed kinetic Monte Carlo (KMC) approaches to better understand the electronic processes of printed electronic devices. In particular, she has considered photovoltaics and light emitting diodes (LEDs). Several different electronic processes take place in these devices, such as charge injection, the formation of excitons (bound electron – hole pairs), charge and exciton migration, and charge recombination/separation (dissociation). The KMCs developed by Walker take into account the complex three-dimensional morphology of the organic active layer and allow for investigations into how device architectures impact device performance. Beyond KMCs, Walker has developed drift-diffusion models to understand the movement of charge and energy in one-dimension.