Direct Solar hydrogen generation is a promising method for renewable hydrogen generation, where solar energy drives the generation of hydrogen and oxygen by molecular dissociation of water on a catalytic/semiconductor surface. Despite an enormous amount of work over the last few decades, direct solar hydrogen generation has not yet been implemented on large scale. Realizing solar-to-hydrogen (STH) efficiencies close to 20% using low cost systems is a critical step in ensuring the commercial viability of large scale solar hydrogen generation . We have recently demonstrated high-efficiency, stand-alone solar hydrogen generation using perovskite- silicon tandem photo absorbers in a photoelectrochemical cell (Fig. 1(a)). We developed a p+nn+Si/Ti/Pt photocathode with an applied bias photon-to-current efficiency (ABPE) of 14.1%, with a stability of three days under continuous illumination. Solar to hydrogen conversion efficiency of 17.6% is achieved on combining with semitransparent perovskite solar cell of optimised bandgap and IrRu anode.