Halide-Induced Band Gap Modulation in RbPbCl3-XBrX Perovskites: Insights from a First-Principles Study
First-principles calculations based on density functional theory (DFT) as implemented in Quantum ESPRESSO were used to systematically investigate the structural and electronic properties of inorganic halide perovskites RbPbCl3-xBrx (x = 0.00, 0.25, 1.50, 2.75, and 3.00). The generalized gradient approximation (GGA) wit...