Photo - induced absolute negative current in a symmetric molecular electronic bridge

The study of current induced by photo-radiating a molecular based device under bias is of fundamental importance to the improvement of photoconductors and photovoltaics. In this technology, electron pumps generate an uphill current that opposes a potential drop and thereby recharges a fuel cell. While the modeled molecular electron pump is completely symmetric, the sign of the photo current is solely determined by the existing bias and the nature of photo induced electronic excitations. The photo radiation induces non-equilibrium population of the electrode-coupled system. The dependence of the photocurrent on electrode coupling, photo radiation field strength and applied bias are studied at a basic model level.