Perovskite Tandems Advance Solar Hydrogen Production

Benchmark solar to hydrogen conversion efficiency of 18.7% was achieved via photovoltaic cell–electrolyzer system without using well-known expensive III-V-based light absorber. Comparison with previous studies indicates that this efficiency bench is impressive for using less junction (2jn instead of 3∼4jn for III/V), relatively cheap perovskite and silicone solar cell, and high solar electricity to chemical efficiency (74.2%).