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A new method to prepare a compact TiO 2 layer for perovskite solar cells is introduced. The method features a UV-assisted chemical bath in an aqueous TiBr 4 solution. The process does not require sophisticated systems to implement making scaling-up easy and the precursor ensures a uniform TiO 2 layer with densely-packed planar grains. UV light provides an alternative to the temperature-assisted CBD process and eliminates the necessity to stir the solution during a deposition that opens new horizons for further scaling up PSCs. The new compact layer was compared to the spin-coated TiO 2 layer and it was found that the novel method allows obtaining a more uniform layer with conformal coverage of the substrate. The new TiO 2 layer was tested for perovskite solar cells and showed an improvement in open-circuit voltage (V OC) which can be explained by improved morphology and surface coverage of the TiO 2 layer. [Display omitted] [ABSTRACT FROM AUTHOR]