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%.