Issue 19, 2020

Degradation induced lattice anchoring self-passivation in CsPbI3−xBrx

Abstract

The all-inorganic halide perovskite (CsPbI3) holds promise for photovoltaic applications but suffers from a detrimental phase transformation to a non-perovskite phase δ-CsPbI3 at low-temperature. Of the different perovskite polymorphs, there has been a wide range of studies on γ-CsPbI3 due to its kinetic stability at near room-temperature. However, synthesis routes to this and other all-inorganic halide perovskites are still not ideal, requiring uneconomical elimination of humidity as well as quenching from elevated temperature. Water/moisture is commonly meticulously avoided due the fact that it can accelerate the detrimental degradation of the perovskite. In our synthesis, we used an alternative approach of engineering an in situ degradation process to form a dual-functional PbI(OH) protective covering and succeeded in performing the first room-temperature synthesis of γ-CsPbI3 under ambient humidity. The vastly improved stability benefits from both lattice anchoring and physical coverage of γ-CsPbI3 by an ultra-thin PbI(OH) layer. The resultant γ-CsPbI3 is stable for more than 2 months under ambient conditions (25 °C, RH = 30–60%) and more than 12 hours at 175 °C in air without any degradation. Furthermore, we show that this novel facile method can be successfully applied to mixed halide perovskites such as CsPbI2Br, and this has allowed the first experimental synthesis of the γ-polymorph of CsPbI2Br. Thus, our work provides an efficient degradation-induced lattice-anchoring self-stabilization strategy and a new avenue to the economical synthesis of all-inorganic perovskite materials at room-temperature under ambient conditions.

Graphical abstract: Degradation induced lattice anchoring self-passivation in CsPbI3−xBrx

Supplementary files

Article information

Article type
Paper
Submitted
24 Febr. 2020
Accepted
30 Apr. 2020
First published
30 Apr. 2020
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2020,8, 9963-9969

Degradation induced lattice anchoring self-passivation in CsPbI3−xBrx

J. Xiu, B. Dong, E. Driscoll, X. Feng, A. Muhammad, S. Chen, Z. Du, Y. Zhu, Z. Zhang, Z. Tang, Z. He and P. R. Slater, J. Mater. Chem. A, 2020, 8, 9963 DOI: 10.1039/D0TA02210A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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