Abstract
Hybrid inorganic-organic perovskites have proven to be a revolutionary material for low-cost photovoltaic applications. They also exhibit many other interesting properties, including giant Rashba splitting, large-radius Wannier excitons, and novel magneto-optical effects. Understanding these properties as well as the detailed mechanism of photovoltaics requires a reliable and accessible electronic structure, on which models of transport, excitonic, and magneto-optical properties can be efficiently developed. Here we construct an effective-mass model for the hybrid perovskites based on the group theory, experiment, and first-principles calculations. Using this model, we relate the Rashba splitting with the inversion-asymmetry parameter in the tetragonal perovskites, evaluate anisotropic g-factors for both conduction and valence bands, and elucidate the magnetic-field effect on photoluminescence and its dependence on the intensity of photoexcitation. The diamagnetic effect of exciton is calculated for an arbitrarily strong magnetic field. The pronounced excitonic peak emerged at intermediate magnetic fields in cyclotron resonance is assigned to the 3D±2 states, whose splitting can be used to estimate the difference in the effective masses of electron and hole.
Highlights
We construct an effective-mass model of CH3NH3PbI3 based on information available in literature
This model, which can be extended to other hybrid perovskites by using suitable parameters, reveals connections among the g-factors, effective masses, and Rashba spin splittings
The experimentally observed pronounced excitonic absorption peak, induced by the magnetic-field, can be attributed to the 3D±2 states, whose energy splitting can be used to determine the difference in electron and hole effective masses
Summary
We construct an effective-mass model of CH3NH3PbI3 based on information available in literature. The experimentally observed pronounced excitonic absorption peak, induced by the magnetic-field, can be attributed to the 3D±2 states, whose energy splitting can be used to determine the difference in electron and hole effective masses.
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