A photovoltaic device, comprises (1) a first conductive layer, (2) an optional blocking layer, on the first conductive layer, (3) a semiconductor layer, on the first conductive layer, (4) n light-harvesting material, on the semiconductor layer, (5) a hole transport material, on the light-harvesting material, and (6) a second conductive layer, on the hole transport material. The light harvesting material comprises, a pervoskite absorber, and the second conductive layer comprises nickel. The semiconductor layer tray comprise TiO2 nanowires. The light-harvesting material may comprise a pervoskite absorber containing a psuedohalogen.