Nano fibers of lead free perovskite Cesium Titanium Bromide (CsTiBr₃) thin films by in-house deposition technique

A novel lead free nano fibers of Cesium Titanium Bromide (CsTiBr₃) perovskite is synthesized on commercial glass substrate by a two stage deposition method for the first time. Cesium Bromide thin film prepared by vacuum evaporation by resistive heating is the substrate for deposition of Titanium Bromide (TiBr₄) vapor by an in-house deposition arrangement. The duration of deposition of TiBr₄ vapor on CsBr thin film plays a key role on the structural, compositional and morphological properties of CsTiBr₃. The mechanism behind the formation of nano fibers of CsTiBr₃ from polygonal grains of CsBr is discussed in detail. The grain boundary grooving of CsBr polygonal grains influences the evolution and dimension of CsTiBr₃ nano fibers. The nano fiber structure and lead free nature makes this novel perovskite a promising candidate for sensors, nanolasers and for future nanoelectronics. (paper)