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To realize the high efficiency potential of perovskite chalcopyrite tandem solar cells in  modules, hydrogenated In2O3  IO H  as electrode is investigated. IO H with an electron mobility of 100 cm2V 1 s 1 is demonstrated. Compared to the conventional Sn doped In2O3  ITO , IO H exhibits a decreased electron concentration and leads to almost no sub bandgap absorption up to the wavelength of 1200nm. Without a trade off between transparency and lateral resistance in the IO H electrode, the tandem cell keeps increasing in efficiency as the IO H thickness increases and efficiencies above 22  are calculated. In contrast, the cells with ITO as electrode perform much worse due to the severe parasitic absorption in ITO. This indicates that IO H has the potential to lead to high efficiencies, which is otherwise constrained by the parasitic absorption in conventional transparent conductive oxide electrode for tandem solar cells in module

Enhanced absorption in tandem solar cells by applying hydrogenated In2O3 as electrode