Size-selective optically excited capacitance transient spectroscopy of InAs/GaAs quantum dots

We investigate the electronic properties of InAs/GaAs quantum dots using capacitance transient spectroscopy after charging by illumination. This method combines the advantages of optical spectroscopy of inter-band exciton transitions and electrical charge detection methods. The emission of holes is observed after monochromatic optical charging. It is shown that resonant absorption leads to size-selective charging of sub-ensembles of quantum dots.