SPECTROSCOPIC CHARACTERIZATION OF PEROVSKITE THIN FILMS

Abstract

Perovskite thin films have emerged as a transformative material class in modern optoelectronic and photovoltaic research. Their exceptional optical absorption, tunable bandgap, and low-cost synthesis have fueled unprecedented progress in solar cell efficiencies. This paper presents a detailed spectroscopic characterization of methylammonium lead halide perovskite (CH₃NH₃PbI₃) thin films fabricated using spin-coating. UV–Vis spectroscopy, photoluminescence (PL), and Fourier-transform infrared spectroscopy (FTIR) were employed to investigate electronic transitions, defect states, and vibrational modes. Results reveal that controlled annealing significantly influences crystallinity and optoelectronic response, offering pathways for optimization in next-generation perovskite devices.