Homogenizing out-of-plane cation composition in perovskite solar cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37913815.
- Also identified by DOI 10.1038/s41586-023-06784-0 and PMC identifier 10733143.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Perovskite solar cells with the formula FA<sub>1-x</sub>Cs<sub>x</sub>PbI<sub>3</sub>, where FA is formamidinium, provide an attractive option for integrating high efficiency, durable stability and compatibility with scaled-up fabrication. Despite the incorporation of Cs cations, which could potentially enable a perfect perovskite lattice<sup>1,2</sup>, the compositional inhomogeneity caused by A-site cation segregation is likely to be detrimental to the photovoltaic performance of the solar cells<sup>3,4</sup>. Here we visualized the out-of-plane compositional inhomogeneity along the vertical direction across perovskite films and identified the underlying reasons for the inhomogeneity and its potential impact for devices. We devised a strategy using 1-(phenylsulfonyl)pyrrole to homogenize the distribution of cation composition in perovskite films. The resultant p-i-n devices yielded a certified steady-state photon-to-electron conversion efficiency of 25.2% and durable stability.