Issue 41, 2017

Tuning the A-site cation composition of FA perovskites for efficient and stable NiO-based p–i–n perovskite solar cells

Abstract

Cation mixing has proved to be effective in stabilizing the high-temperature phase of formamidinium (FA)-based perovskites, affording high-performance n–i–p perovskite solar cells (PSCs). However, optimum cation mixing is found to be inapplicable directly to NiO p–i–n PSCs due to the energy band misalignment. In the present study, we reveal the role of mixing cesium (Cs), methylammonium (MA) and formamidinium (FA) in the energy band alignments and the crystallization of perovskites in such a device structure. By tuning the composition of mixed cations, we have significantly improved the energy band alignments of perovskites in p–i–n NiO-based PSCs. The relative amount of Cs to MA cations also plays a decisive role in shaping the nature of perovskite precursors, thus impacting the quality of the resulting perovskite layer in NiO p–i–n PSCs. These insights and the associated engineering efforts led to a significantly improved power conversion efficiency of 18.6% based on the NiO p–i–n PSCs, in addition to their superior ambient stability to typical n–i–p PSCs.

Graphical abstract: Tuning the A-site cation composition of FA perovskites for efficient and stable NiO-based p–i–n perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
13 Aug 2017
Accepted
20 Sep 2017
First published
20 Sep 2017

J. Mater. Chem. A, 2017,5, 21858-21865

Tuning the A-site cation composition of FA perovskites for efficient and stable NiO-based p–i–n perovskite solar cells

C. Hu, Y. Bai, S. Xiao, T. Zhang, X. Meng, W. K. Ng, Y. Yang, K. S. Wong, H. Chen and S. Yang, J. Mater. Chem. A, 2017, 5, 21858 DOI: 10.1039/C7TA07139F

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