ZnO−TiO₂ Core−Shell Nanorod/P3HT Solar Cells

Abstract

We evaluate an ordered organic−inorganic solar cell architecture based on ZnO−TiO₂ core−shell nanorod\narrays encased in the hole-conducting polymer P3HT. Thin shells of TiO₂ grown on the ZnO nanorods by\natomic layer deposition significantly increase the voltage and fill factor relative to devices without shells. We\nfind that the core−shell cells must be exposed to air to reproducibly attain efficiencies higher than 0.05%.\nCells stored in air for 1 month are 0.29% efficient.