Synthesis, optical and structural properties of quantum-wells crystals grown into porous alumina

• Porous anodic alumina (PAA) were prepared in a two-step anodizing process.
• Organic–inorganic perovskite embedded on PAA.
• Confinement effect of the incorporation of perovskite compounds quantum wells into different porous anodic aluminum.
• New approach to stabilize the organic–inorganic perovskite crystal for optoelectronic devises applications.

In this work, we present the confinement effect of the incorporation of perovskite compounds (C12H25–NH3)2PbI4 quantum wells into different porous anodic aluminum oxide (PAA) matrix via a chemical route. The detailed structure and optical property of the quantum wells in PAA were characterized by FT-IR, UV–Vis absorption and photoluminescence (PL) spectroscopy. The surface topography for the two used PAA matrix has been studied using atomic force microscopy (AFM). The pores diameters (pores spacing) for the two matrix are 15 (35 nm) and 45 (82 nm). UV–visible and photoluminescence spectroscopy of (C12H25–NH3)2PbI4/PAA exhibits a clear blue shift of the fundamental excitonic transition. This effect is attributed to the confinement of the exciton mode in the pore of the PAA matrix.