  Much efforts are devoted to material structuring in a quest to enhance the
photovoltaic effect. We show that structuring light in a way it transfers
orbital angular momentum to semiconductor-based rings results in a steady
charge accumulation at the outer boundaries that be utilized for the generation
of an open circuit voltage or a photogalvanic (bulk photovoltaic) type current.
This effect which stems both from structuring light and matter (confinement
potentials), can be magnified even at fixed moderate intensities, by increasing
the orbital angular momentum of light which strengthens the effective
centrifugal potential that repels the charge outwards. Based on a full
numerical time propagation of the carriers wave functions in the presence of
light pulses we demonstrate how the charge buildup leads to a useable voltage
or directed photocurrent whose amplitudes and directions are controllable by
the light pulse parameters.
