| Title: |
Ammonium thiocyanate enables in-situ structural templating of MAPbI 3 via quasi-2D perovskite scaffold |
| Authors: |
Alexandra Ramadan; Sophie Tucker; David Lidzey; Robert Oliver; Alice Pyne; Rachel Kilbride; Elena Cassella; Jessica Persaud; Faiz Mandani; Niranjana Raj; Max Allen; Charlie Nicholls; Silvia Motti; Jacky Even; Aditya Mohite |
| Publication Year: |
2026 |
| Collection: |
The University of Sheffield: Figshare |
| Subject Terms: |
Optical properties of materials; Physical properties of materials; Structure and dynamics of materials; Structural properties of condensed matter; Perovskite solar cells; Quasi-2D perovskite; structural templating |
| Description: |
Ammonium thiocyanate (NH 4 SCN) has been used extensively to improve the current extraction and device performance of quasi-two-dimensional Ruddlesden-Popper perovskite solar cells. Whilst this additive has been shown to influence quasi-2D perovskite crystallisation, a detailed understanding of its mechanism has not yet been established, limiting its use to only a few perovskite compositions. Through spectroscopic and structural studies, we demonstrate that NH 4 SCN acts to kinetically control the quasi-2D perovskite phase formation. In a 4-fluorophenethylammonium quasi-2D perovskite we show that this additive suppresses the unfavourable n = 1 perovskite phase. This allows the quasi-2D perovskite to structurally template the 3D MAPbI 3 perovskite, enabled by the fact that there is close lattice matching between this phase and the n = 2 quasi-2D phase. The result is a highly ordered, crystalline perovskite. This templated growth is evidenced by compressive strain acting on the 3D perovskite unit cell to match the scaffolding quasi-2D phase. Unlike previous reports we suggest that the benefit of this additive comes predominantly from an improvement to the 3D perovskite structure. Furthermore, we show that this structural control is cation dependent, requiring both close lattice matching between quasi-2D and 3D perovskite phases, and successful kinetic control of the relevant quasi-2D phases. |
| Document Type: |
dataset |
| Language: |
unknown |
| DOI: |
10.15131/shef.data.31890619.v1 |
| Availability: |
https://doi.org/10.15131/shef.data.31890619.v1; https://figshare.com/articles/dataset/Ammonium_thiocyanate_enables_i_in-situ_i_structural_templating_of_MAPbI_sub_3_sub_i_via_i_quasi-2D_perovskite_scaffold/31890619 |
| Rights: |
CC BY 4.0 |
| Accession Number: |
edsbas.8ADF7F21 |
| Database: |
BASE |