Issue 37, 2022

Impact of processing conditions on the film formation of lead-free halide double perovskite Cs2AgBiBr6

Abstract

Lead-free halide double perovskites with enhanced stability have gained attention as a promising environmentally friendly alternative to lead-based halide perovskites. Amongst different halide double perovskites, Cs2AgBiBr6 has shown attractive optoelectronic properties and stability, making it a promising candidate for stable high-efficiency optoelectronic devices. Motivated by a data mining effort, we present here the effects of different processing strategies on the microstructure and thin-film formation dynamics of Cs2AgBiBr6. We apply some of the most successfully used solvent engineering approaches from the halide perovskite research to halide double perovskites, namely antisolvent- and additive-assisted synthesis. Using in situ spectroscopy and diffraction, the film formation of Cs2AgBiBr6 is investigated during spin coating, and the subsequent post-deposition thermal annealing. Dropping antisolvents during spin coating induces immediate supersaturation and crystallization of the wet film, whereas the time of dropping the antisolvent has implications on the film formation dynamics and the final microstructure. For additive (HBr)-assisted synthesis, we show how the addition of HBr affects colloid formation in solution and thus influences the crystallization pathway during thin-film processing. Finally, HBr additive simplifies synthesis in that it doesn't require solution and substrate preheating to obtain pinhole-free films even with higher thickness.

Graphical abstract: Impact of processing conditions on the film formation of lead-free halide double perovskite Cs2AgBiBr6

Supplementary files

Article information

Article type
Paper
Submitted
27 яну 2022
Accepted
17 май 2022
First published
18 май 2022

J. Mater. Chem. A, 2022,10, 19868-19880

Author version available

Impact of processing conditions on the film formation of lead-free halide double perovskite Cs2AgBiBr6

M. Abdelsamie, K. Cruse, N. Tamura, G. Ceder and C. M. Sutter-Fella, J. Mater. Chem. A, 2022, 10, 19868 DOI: 10.1039/D2TA00763K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements