Effect of an Ultrathin TiO₂ Layer Coated on Submicrometer‐Sized ZnO Nanocrystallite Aggregates by Atomic Layer Deposition on the Performance of Dye‐Sensitized Solar Cells

An ultrathin TiO2 layer is successfully coated on the surface of sub-m-sized aggregates of ZnO nanocrystallites through the atomic layer deposition (ALD) technique. The ZnO core/TiO2 shell structure increases the open-circuit voltage, without impairing the photocurrent density and results in an increased power conversion efficiency from 5.2% to 6.3%.