DOI: https://doi.org/10.29363/nanoge.emlem.2022.033
Publication date: 15th July 2022
In the past few years, lead-halide perovskites have appeared as a new generation of promising semiconductor materials for photovoltaic and optoelectronic applications. Belonging to this family, CsPbCl3 have the largest energy band gap showing an absorption threshold and photoluminescence in the blue spectral region.
As a representative of this new class, CsPbCl3 has the largest energy band gap, hence showing an absorption threshold and a photoluminescence emission in the blue spectral region. The manifestation of polaritonic effects at room temperature makes it a privileged candidate for new photonic devices and suggests moreover that excitons are particularly robust [1].
Here we present the results of high magnetic field spectroscopy on bulk CsPbCl3 thin films that allow to obtain the fundamental exciton parameters, as the exciton binding energy, the effective mass, dielectric constant and Landé factors. We confirm the strong value of the exciton binding energy that makes it very stable at room temperature. We compare our results with results obtained by other authors in a wide range of different halide perovskites and we provide evidence of universal laws according to the gap energy. In particular the binding energy law is obtained by comparing perovskite compounds and other more conventional semiconductor materials [2].
The electron-hole exchange interaction related to Coulomb interaction is responsible in semiconductors of the splitting of the lowest-energy degenerate exciton state leading to the so-called exciton fine structure(EFS). Taking into account the measured excitonic parameters in bulk CsPbCl3 we will finally discuss the EFS of CsPbCl3 nanocrystals considering symmetries, shape anisotropy and environmental parameters.
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Ministry of Education—Singapore (MOE2018- T2-2-068, MOE2018-T3-1-002, RG103/15 and RG113/16); National Science Centre Poland (OPUS 2019/33/B/ST3/ 01915); Agence Nationale de la Recherche (ANR- 18-CE30- 0023-01, ANR-10-LABX-0037-NEXT).
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