Modified Synthesis of Cs4PbBr6 for Enhanced Purity and Quantum Yield and for Exploring Its Potential As a High Stokes Shift Material for Down‐conversion in Solar Cells

Energy demands have kept increasing in recent years due to expanding human activity. Silicon solar cells offer an attractive renewable energy source while their external quantum efficiency can still be enhanced; one way of doing this is by applying a photon energy downshifting layer. Herein, we apply Cs4PbBr6 as a downshifting layer; the Cs4PbBr6 was synthesized in the form of colloidal nanoparticles, and several modifications were introduced to the synthesis process, resulting in enhancement of the photoluminescence quantum yield, improving the particle size distribution and reducing the CsBr impurities which appear as a side product during the synthesis of Cs4PbBr6. The application of the produced modified particles in the form of thin films on the top of Si solar cells has shown an enhancement of the external quantum efficiency of the solar cells when compared to the unmodified particles.This article is protected by copyright. All rights reserved.