Publication date: 15th December 2025
The outstanding optoelectronic properties of lead-halide perovskites have made them prominent emerging materials for several applications, from solar cells to quantum light emitters. In such devices, heterostructuring between perovskite materials may provide the key to operational stability and functionality. We will start by discussing the issue of calculating band alignment at interfaces, a crucial factor for device performance. We will then present the theory of excitons trapped in self-assembled buried quantum dots, which have allowed single-photon generation within an electrically injected thin-film device. In these systems, a semi-empirical approach based on the enveloppe function approximation gives access to the photoluminescence energy and fine structure of quantum-confined excitons, a meV-scale spin-related splitting of the excitonic ground state into four levels of differing oscillator strength. The calculation of these quantities as a function of the quantum dot size may be of significant use in the interpretation of single-dot photoluminescence data.
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