Optical Absorption on Electron Quantum-Confined States of Perovskite Quantum Dots

In the framework of the dipole approximation, it is shown that in the perovskites quantum dots (QDs) FAPbBr3 and {en} FAPbBr3 interacting with low-intensity light, the oscillator strengths of transitions, as well as the dipole moments allowing transitions between one-particle electron quantum-confined states, attain values considerably (by two orders of magnitude) exceeding the typical values of the corresponding quantities in semiconductors. It has been established that the maximum values of the cross-section optical absorption of perovskite QDs are reached at the resonant frequencies of electron transitions. This makes it possible to use such nanosystems as of strong absorption nanomaterials in a wide range of infrared waves.