SeriesInformation ; 23rd European Photovoltaic Solar Energy Conference and Exhibition, 1-5 September 2008, Valencia, Spain; 320-322 ; Abstract ; We use our recently developed microscopic approach to a quantum theory of the photovoltaic processes in nanostructures to investigate geometry effects in quantum well photovoltaics, focusing on the role of asymmetry and interwell coupling in double quantum well (DQW) systems. For that purpose, the IV and power characteristics for DQW systems with different asymmetry and degree of coupling are determined numerically in the vicinity of the maximum power point. In order to assess the transport properties of a specific QW structure, we isolate these from the effects of absorption by normalizing to the absorptivity. The results obtained from this procedure reveal the escape regime dominating at room temperature and are in agreement with previous experimental observations.