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This manuscript describes the evolution of grain structures in Cesium Halidefilms which results in appearance of Surface Plasmon Resonance (SPR) peaks inUV-visible absorption spectra. Thin films of Cesium Halide grown by thermalevaporation are polycrystalline in nature with large irregular tightly packedgrains with sharp grain boundaries. With time these grain boundaries recede tobecome smaller and spherical in shape in order to minimize the free surfaceenergy of the system. The process is also assisted by the presence of pointdefects/color centers in Cesium Halide films. These defects which appear due tothe absence of massive halide atoms from the lattice results in residualtensile stress within the lattice which results in defect diffusion. Thedefects migrate outwards towards the grain surface giving rise to Cesium metalclusters. The lattice mismatch appearing between the lattices at the grainboundary and the bulk giving rise to Core-shell structure further contributesto grain division. Along with this volume diffusion, a surface diffusion ofCesium takes place towards sites of faceted grain boundaries resulting in anecking phenomenon, appearing like bridges between the daughter Cesium Halidegrains (grains appearing due to division of a single grain). Breaking away ofthe daughter Cesium Halide grains results in nano-rods that contribute to theSPR peak seen.

Contribution of Halides in CsX (X=Cl, Br and I) Thin Films on the formation of SPR peaks