Structural and Optical Characterization of Spin-Coated Perovskite MAPbI3-xBrx Nano-Needles

The presented paper dals with perovskite MAPbI(3 - x)Br(x) nano-needles synthesized on the glass substrates by the spin coating technic. X-ray patterns showed the formation of the tetragonal phase. The crystallite size was almost constant by increasing the Br concentration up to 25%. Optical measurements showed a linear increase of the energy band gap by increasing the Br concentration, leading to the blue shift of the absorption onset. Scanning electron microscopy images showed the formation of the needle-like shapes. The grain size evolution is explained basing on the current studies.

Automated summary

The presented paper discusses the synthesis of perovskite MAPbI(3 - x)Br(x) nano-needles on glass substrates using the spin coating technique. X-ray patterns confirmed the formation of the tetragonal phase. The size of crystallites remained almost constant with increasing Br concentration up to 25%. Optical measurements showed that the energy band gap increased linearly with the Br concentration, resulting in a blue shift in the absorption onset. Scanning electron microscopy images revealed the formation of needle-like shapes. The evolution of grain size is explained based on current studies.