Issue 16, 2024

Suppressing charge recombination in a methylammonium-free wide-bandgap perovskite film for high-performance and stable perovskite solar cells

Abstract

Wide-bandgap (WBG) formamidinium–cesium (FA–Cs) hybrid lead iodide–bromide mixed perovskites (∼1.7 eV) have gained great attention with the potential of enabling highly efficient tandem photovoltaics when integrated with crystalline silicon and other low-bandgap solar cells. However, their power conversion efficiencies (PCEs) are still insufficient compared to their methylammonium (MA) counterparts, mainly owing to the high open-circuit voltage (VOC) deficits (>0.43 V). Here, by incorporating rubidium iodide (RbI) in the FA0.8Cs0.2Pb(I0.75Br0.25)3 perovskite precursor, the film crystallinity and bulk defects are significantly optimized. In addition, we propose an all-around interface engineering strategy sequentially constructing a surface heterojunction and using trioctylphosphine oxide (TOPO), which can significantly passivate grain boundaries and undercoordinated defects, as well as optimize the energy band. As a result, the target MA-free WBG n–i–p solar cells at 1.685 eV have achieved a record efficiency of 23.35% and a high VOC of 1.30 V (with a record voltage deficit of 0.385 V). Most importantly, the unencapsulated solar cells also display impressive air storage stability, operating stability and thermal stability. Moreover, a PCE of 19.54% on a 1 cm2 WBG solar cell and a PCE of 21.31% on a 0.04 cm2 p–i–n inverted WBG solar cell are also demonstrated.

Graphical abstract: Suppressing charge recombination in a methylammonium-free wide-bandgap perovskite film for high-performance and stable perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
10 Feb 2024
Accepted
29 Apr 2024
First published
03 May 2024

Energy Environ. Sci., 2024,17, 5866-5875

Suppressing charge recombination in a methylammonium-free wide-bandgap perovskite film for high-performance and stable perovskite solar cells

Q. Ye, W. Hu, J. Zhu, Z. Cai, H. Zhang, T. Dong, B. Yu, F. Chen, X. Wei, B. Yao, W. Dou, Z. Fang, F. Ye, Z. Liu and T. Li, Energy Environ. Sci., 2024, 17, 5866 DOI: 10.1039/D4EE00666F

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