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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.68: Poster

Montag, 27. März 2023, 13:00–15:00, P2/EG

Rational design of halide perovskite-based quantum dots using ab-inotio many body techniques — •Manaswita Kar, Benjamin Lenz, and Michele Casula — IMPMC, Sorbonne Université-CNRS, Jussieu, 75005 Paris, France

Quantum dots (QDs) have attracted increasing attention as next generation functional materials, because of their unique size dependent colour tunability, due to quantum-confinement effect. However, the cost of production of these QDs is very high, thereby limiting their large scale industrial applications. Halide perovskite-based QDs provide single photon emission at room temperature and can be manufactured comparatively easily. These perovskites have a complex structural form and bears a large compositional space. As a result of this, only a limited number of these perovskite QDs have been tested so far. Here, we aim to identify the most promising perovskite based QDs for coherent photon emission applications by characterising their optical properties from theoretical simulations. Towards this aim, we employ the many body Green's function (GW) and Bethe-Salpeter equation (BSE) techniques to study the excited state properties of the QDs, which are known to be not well captured by standard ground state methods, such as Density Functional Theory (DFT). From this study, we finally envision find the best halide perovskite based quantum dot, that is both structurally and thermodynamically stable and can be manufactured for large scale commercial applications.