Issue 48, 2020

Compositional optimization of a 2D–3D heterojunction interface for 22.6% efficient and stable planar perovskite solar cells

Abstract

The stacking of 2D perovskites on the top of 3D perovskites has been recognized as a promising interfacial treatment approach to improve the stability and efficiency of planar perovskite solar cells (PSCs). However, traditional 2D–3D perovskite heterojunctions obtained from the high-temperature annealing process still exhibit unsatisfactory charge transfer performance and interfacial voltage loss. Herein, we introduce isopentylammonium iodide (PNAI) as the large organic ammonium salt, and adjust the in situ grown processes of 2D perovskites by thermal treatments to form a multi-component capping layer composed of 2D perovskites with plenty of high n-value 2D phases (n ≥ 3, n is the number of inorganic layers) and residual PNAI molecules on 3D perovskites. Such an optimized composition for a 2D–3D perovskite heterojunction can remarkably improve the charge transfer performance, further suppress the interfacial ionic defects, and enlarge Fermi-level splitting, leading to a low bandgap-to-voltage loss (0.38 V). Consequently, this treatment strategy significantly improves the efficiency of planar PSCs to 22.62% with an outstanding open-circuit voltage of 1.16 V. Moreover, the unencapsulated PNAI-90 treated device stored under a relative humidity of 30 ± 5% for 1000 h still retains 89% of its initial PCE. This work offers a new strategy to construct a robust 2D–3D heterojunction for planar PSCs.

Graphical abstract: Compositional optimization of a 2D–3D heterojunction interface for 22.6% efficient and stable planar perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
19 Sep 2020
Accepted
19 Nov 2020
First published
20 Nov 2020

J. Mater. Chem. A, 2020,8, 25831-25841

Compositional optimization of a 2D–3D heterojunction interface for 22.6% efficient and stable planar perovskite solar cells

M. He, J. Liang, Z. Zhang, Y. Qiu, Z. Deng, H. Xu, J. Wang, Y. Yang, Z. Chen and C. Chen, J. Mater. Chem. A, 2020, 8, 25831 DOI: 10.1039/D0TA09209F

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