Abstract
The photovoltaic characteristics of A1/44 monolayers of Chl b/Ag sandwich cells are reported. Open-circuit photovoltages as high as 1.1 V were observed for most photovoltaic cells. The variation of the shortcircuit photocurrent with light intensity is shown to be strongly dependent upon the wavelength of illumination. The low fill factor values of the Chl b cells (0.15–0.19) are related to the large internal resistance of the devices, which is mainly caused by the insulating layer present at the aluminium/pigment junction. The short-circuit photocurrent is found to increase exponentially with temperature. An activation energy of 0.19 eV was determined at the maximum absorption in the red region.