Dual layer photovoltaic device

A hybrid photovoltaic device comprising

• a thin film solar cell disposed in a first layer comprising an array of vertically aligned nanowires, said nanowires having a junction with a first band gap corresponding to a first spectral range, wherein said nanowires form absorbing regions, and non-absorbing regions are formed between the nanowires, wherein the nanowires are connected on one side of the junction to a top transparent electrode, and on the other side to the bottom transparent electrode;
• a bulk solar cell disposed in a second layer, positioned below the first layer, having a junction with a second band gap, which is smaller than said first band gap and corresponding to a second spectral range;
• a transparent cover disposed above the thin film solar cell;
• wherein the nanowires are provided in the first layer with a lateral density selected a such that a predetermined portion of an incident photonic wave-front will pass through the non-absorbing regions without absorption in the first spectral range, into the bulk solar cell for absorption in both the first spectral range and the second spectral range.