  2D Ruddlesden Popper perovskites have been extensively studied for their
exceptional optical and electronic characteristics while only a few studies
have shed light on their mechanical properties. The existing literature mainly
discusses the mechanical strength of single crystal perovskites, however a
systematic study towards structure tunability of 2D perovskite thin films is
still missing. In this study, we report the effect of number of inorganic
layers `n' on elastic modulus of Butylammonium based 2D, quasi-2D perovskites
and 3D perovskite using nanoindentation technique. The experimental results
have also been substantiated using first principle density functional theory
calculations. Understanding the mechanical behaviour of 2D Ruddlesden Popper
perovskites thin films in comparison with conventional 3D perovskite offers
intriguing insights into the atomic layer dependent properties and paves the
path for next generation mechanically durable novel devices.
