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Composition-tuned MAPbBr3 nanoparticles with addition of Cs+ cations for improved photoluminescence.

ABSTRACT: Hybrid organic-inorganic lead halide perovskite nanoparticles are promising candidates for optoelectronic applications. This investigation describes the structural and optical properties of MA x Cs1-x PbBr3 mixed cation colloidal nanoparticles spanning the complete compositional range of Cs substitution. A monotonic progression in the cubic lattice parameter (a) with changes in the Cs+ content confirmed the formation of mixed cation materials. More importantly, time-resolved photoluminescence (TRPL) revealed the optimized 13 mol% Cs nanoparticle composition exhibits the longest charge carrier lifetime and enhancement in radiative pathways. This sample also showed the highest photoluminescence quantum yield (PLQY) of ∼88% and displays ∼100% improvement in the PLQY of pure MAPbBr3 and CsPbBr3. Prototype LEDs fabricated from MA0.87Cs0.13PbBr3 were demonstrated.

SUBMITTER: Dintakurti SSH 

PROVIDER: S-EPMC9036789 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Composition-tuned MAPbBr<sub>3</sub> nanoparticles with addition of Cs<sup>+</sup> cations for improved photoluminescence.

Dintakurti Sai S H SSH   Vashishtha Parth P   Giovanni David D   Fang Yanan Y   Foo Norton N   Shen Zexiang Z   Guet Claude C   Sum Tze Chien TC   White Tim T  

RSC advances 20210708 39

Hybrid organic-inorganic lead halide perovskite nanoparticles are promising candidates for optoelectronic applications. This investigation describes the structural and optical properties of MA <sub><i>x</i></sub> Cs<sub>1-<i>x</i></sub> PbBr<sub>3</sub> mixed cation colloidal nanoparticles spanning the complete compositional range of Cs substitution. A monotonic progression in the cubic lattice parameter (<i>a</i>) with changes in the Cs<sup>+</sup> content confirmed the formation of mixed catio  ...[more]

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