Work

Near-Unity Photoluminescence Quantum Yield in CsPbBr3 Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

Year: 2017

Type: article

Abstract: Metal halide perovskite nanocrystals (NCs) possess high photoluminescence (PL) quantum yield (PL) and color tunability. Yet, until now, it has been difficult to maintain the high PL observed in solution in spin-coated films. Here, we report a novel CsPbBr3 NCs room-temperature synthesis based on Cs acetate, which displays near-unity PL in solid-state films upon post-synthetic treatment with lead bromide. The as-synthesized NCs show a PL of 80% in spincoated films but the post-synthesis treatment further enhances the efficiency >95%. The high PL is further confirmed by the monomolecular decay of the PL (5.8 ns) indicating a nearly complete suppression of non-radiative channels. The obtained films demonstrate high stability in air and require around 3 weeks to decrease to half the initial PL value.

Source: Chemistry of Materials

DOI: 10.1021/acs.chemmater.7b02834

Authors: Francesco Di Stasio, Sotirios Christodoulou, Nengjie Huo, Gerasimos Konstantatos

Institutions: Institute of Photonic Sciences, Barcelona Institute of Science and Technology, Institució Catalana de Recerca i Estudis Avançats

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: European Regional Development Fund, H2020 European Research Council, H2020 Marie Skłodowska-Curie Actions

Awards: G1393669713, G3822251797, Hierarchically Engineered Inorganic Nanomaterials from the atomic to supra-nanocrystalline level as a novel platform for SOLution Processed SOLar cells, G8035701774