Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 26, Pages 14177-14184Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp5027916
Keywords
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Funding
- UNC Energy Frontier Research Center (EFRC) Center for Solar Fuels, an EFRC
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001011]
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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 fiinctionalized 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.
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