Comparing the Cubic and Tetragonal Phases of MAPbI₃ at Room Temperature

Abstract

Stability and maintenance of the crystal structure are the main drawbacks of the application of organic–inorganic perovskites in photovoltaic devices. The ΔT = 62 K robust shift of the structural phase transition observed here allows us to conduct a comprehensive study at room temperature of the tetragonal versus cubic phase on MAPbI3. The absence of the shift in the cubic transition for all-inorganic CsPbI3 samples confirms the importance of both orientation and dynamics of the organic cations. Our results provide a unique opportunity to evaluate the physical properties of both cubic and tetragonal phases of MAPbI3 at the same temperature, eliminating different phonon effects as possible causes for different properties. Besides higher electrical resistivity, the perovskite cubic phase presents a faster charge carrier lifetime than the tetragonal phase and partial PL quenching, pointing toward increased trap-assisted nonradiative recombination. The light absorption coefficient in the cubic phase is larger than the absorption in the tetragonal phase in the green region.

Temperature and pressure induced structural transitions of lead iodide perovskites

“…4e) clearly show the lowering of the transition temperature as a function of annealing time. In their recent thermal annealing of the polycrystalline MAPbI 3 sample, 92 the α-phase has been stabilized even at below room temperature by a shift of 62 K in the transition temperature (Fig. 4f).…”

“…4g), indicating that the ordered–disordered orientation of MA + has a substantial role in the phase transition. 92…”

Emerging Nonlinear Photocurrents in Lead Halide Perovskites for Spintronics

“…It has the ability to absorb the full spectrum of visible light for all wavelengths. In the case of MAPI, there are three different structural phases as a function of temperature: orthorhombic below −113 • C, tetragonal from −113 to 57 • C, and cubic above 57 • C [71].…”

Organic–inorganic hybrid perovskite materials and their application in transistors

“…For HOIPs, these two processes occur at 160 K and 330 K, respectively. 33 The structural phase transition can significantly alter the perovskites' electronic and optical properties. 34…”