This study brings new insights on the development of extra oral protocols for the photocatalytic activity of TiO in oral biofilm-associated disease. Anatase and mixture-TiO showed antibacterial activity on this oral bacterial biofilm, being promising surface coatings for dental implant components.

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a b s t r a c tPerovskite solar cells have attracted attention due its high conversion efficiency and low cost. In this work, Nb 2 O 5 is used as an alternative compact hole blocking layer in conjunction with mesoporous TiO 2 and CH 3 NH 3 PbI 3 in perovskite solar cells. The influence of Nb 2 O 5 layer thickness was studied and it was found to strongly influence the J-V hysteresis of the cells. Devices constructed with 50 nm Nb 2 O 5 have small or undetectable hysteresis, which becomes detectable and increases with increasing Nb 2 O 5 layer thickness. For the best device, energy conversion efficiency of up to 12%, short-circuit currents of 17 mA/cm 2 and fill factors of 74% were found. These parameters are comparable to the best performance of similar devices where the compact layer is TiO 2 . In addition, the use of Nb 2 O 5 improved the stability of the solar cells under illumination. These improvements are attributed to a better extraction of photogenerated electrons in the perovskite layer.

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