Issue 25, 2024

Chemical nanoimaging of octylphosphonic acid molecular additives on hybrid organic–inorganic perovskite films

Abstract

Defect passivation using additives has been demonstrated to be an effective approach to improve the efficiency and stability of perovskite devices. However, understanding the interactions and bonding state between additives and the film surface at the molecular level has been a long-standing challenge, due to the trace concentration of additives and the surface heterogeneity of perovskite films. Herein, by employing a non-destructive and label-free infrared nanospectroscopy technique, we achieved the experimental observations of inhomogeneously distributed additives on the surface of a hybrid organic–inorganic perovskite film, with spatial resolution down to 10 nm. For the first time, the association between the octylphosphonic acid (OPA) molecule and FA0.9MA0.05Cs0.05PbI3 film has been revealed at the molecular level. Chemical nanoimaging revealed that OPA additives were chiefly filled at the edges of the perovskite grain boundaries. With a higher spatial resolution of chemical nanoimaging, the OPA additive molecules were detected at the sub-grain boundary showing distinct cascade distribution characteristics. The analysis of the effect of OPA on the environmental stability of the perovskite proves a comprehensive passivation effect on the surface defect and the decomposition of organic components in perovskite thin films. Our work demonstrates an efficient approach for chemical nanoimaging of perovskites and provides a new spectroscopic insight into the modulation of additives on perovskites.

Graphical abstract: Chemical nanoimaging of octylphosphonic acid molecular additives on hybrid organic–inorganic perovskite films

Supplementary files

Article information

Article type
Paper
Submitted
29 мар 2024
Accepted
14 май 2024
First published
14 май 2024

J. Mater. Chem. A, 2024,12, 15145-15153

Chemical nanoimaging of octylphosphonic acid molecular additives on hybrid organic–inorganic perovskite films

H. Wang, X. Li, C. Guo, Y. Cheng, W. Zhang, Z. Nan, L. Shen, L. Xie, B. Mao, Z. Tian and J. Yi, J. Mater. Chem. A, 2024, 12, 15145 DOI: 10.1039/D4TA02098G

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