Urbach Tail Suppression in Bi-Doped MAPbBr 3 Driven by Water-Assisted Morphological Engineering

Key Points

• The aim is to investigate how water-assisted dissolution-recrystallization affects the properties of Bi-doped MAPbBr3.
• Synthesis of Bi-doped MAPbBr3 using a water-assisted dissolution-recrystallization route.
• Characterization of as-grown microcubes and their optoelectronic properties.
• Controlled recrystallization to promote morphological transformation into wire-like microstructures.
• Analysis of time-resolved photocurrent for understanding photoresponses.
• Lattice contraction and pronounced band tailing observed in as-grown microcubes.
• Quenching of photoluminescence attributed to nonradiative recombination.
• Controlled water-mediated recrystallization led to improved lattice relaxation and defect passivation.
• Suppression of the Urbach tail and restoration of radiative recombination.
• Faster and reversible photoresponses noted, indicating reduced energetic disorder.

Abstract