Charge transport and light-matter interactions go hand-in-hand and are important in areas of science ranging from biology, green energy and energy storage, catalysis, chemistry, physics, to nano-electronics and modern day data processing. In the context of the latter, one of the key challenges is to interface optics with nanoscale electronics. In my group we have been studying the mechanisms of charge transport and light-matter interactions in nanoscale tunnelling junctions were quantum effects dominate.