%0 Journal Article %A Flynn, Cory J. %A Oh, EunBi E. %A McCullough, Shannon M. %A Call, Robert W. %A Donley, Carrie L. %A Lopez, Rene %A Cahoon, James F. %D 2015 %T Hierarchically-Structured NiO Nanoplatelets as Mesoscale p‑Type Photocathodes for Dye-Sensitized Solar Cells %U https://acs.figshare.com/articles/journal_contribution/Hierarchically_Structured_NiO_Nanoplatelets_as_Mesoscale_p_Type_Photocathodes_for_Dye_Sensitized_Solar_Cells/2035743 %R 10.1021/jp5027916.s001 %2 https://acs.figshare.com/ndownloader/files/3607053 %K surface area %K morphology %K material %K charge carrier mobility %K tandem %K exhibit %K NiO %K film %K nm %K DSSC %K performance %K device %X A p-type metal oxide with high surface area and good charge carrier mobility is of paramount importance for development of tandem solar fuel and dye-sensitized solar cell (DSSC) devices. Here, we report the synthesis, hierarchical morphology, electrical properties, and DSSC performance of mesoscale p-type NiO platelets. This material, which exhibits lateral dimensions of 100 nm but thicknesses less than 10 nm, can be controllably functionalized with a high-density array of vertical pores 4–6, 5–9, or 7–23 nm in diameter depending on exact synthetic conditions. Thin films of this porous but still quasi-two-dimensional material retain a high surface area and exhibit electrical mobilities more than 10-fold higher than comparable films of spherical particles with similar doping levels. These advantages lead to a modest, 20–30% improvement in the performance of DSSC devices under simulated 1-sun illumination. The capability to rationally control morphology provides a route for continued development of NiO as a high-efficiency material for tandem solar energy devices. %I ACS Publications