Hybrid organic-inorganic perovskites with the general formula ABX₃ have attracted great attention as light-harvesting materials for the next generation of photovoltaics. Since their first use as photoactive material in 2009[1], power conversion efficiencies (PCE) have already increased to a certified value of 22.1%[2], thereby competing with established thin-film PV technologies. Improvements in PCE have been mostly achieved by advances in the deposition process of CH₃NH₃PbI₃ or mixed halide CH₃NH₃PbI_3-xCl_x absorber layers. Optimized film uniformities and coverages as well as larger crystalline domains seem to be the most important characteristics leading to high performance in the planar heterojunction. Compared to one-pot synthesis of perovskite films from a mixed precursor solution, the sequential deposition of PbI₂ and CH₃NH₃I, first developed in 2014 by Liu et al. for a planar heterojunction device architecture[3], enables better control over film coverage and crystallite formation. The PbI₂ precursor acts as a template for the growth of the final perovskite film, resulting in higher surface coverages and better reproducibility of morphology and JV-performance. Especially for a planar heterojunction configuration, a compact and pin-hole free perovskite layer is necessary to avoid any shunting between the n- and p-type sides as well as low light absorption in the solar cell. We present a way to easily control the morphology of pure iodine CH₃NH₃PbI₃ films by varying the dipping conditions of the PbI₂ precursor layer into an alcoholic CH₃NH₃I-solution. We show that final film coverage, smoothness and crystallite sizes can be finely tuned via concentration, temperature, atmosphere and water content of a CH₃NH₃I/IPA solution, as well as by the thickness of the PbI₂ precursor layer and the dielectric constant of the alcoholic solvent itself. Scanning electron microscopy images will show that it is possible to obtain very compact perovskite layers with large grain sizes in the micrometer range and narrow grain boundaries by simply controlling the immersion-conditions. JV-curves reveal that J_SC, V_OC and fill factors are significantly improved with increasing surface coverage. As these film properties are the main necessity for high performance perovskite solar cells in a planar heterojunction configuration, our results indicate a potentially alternative and easy route compared to e.g. “solvent engineering techniques”.