Revealing the Transient Formation Dynamics and Optoelectronic Properties of 2D Ruddlesden-Popper Phases on 3D Perovskites

Author(s)

Kodalle, Tim ; Moral, Raphael F. ; Scalon, Lucas ; Szostak, Rodrigo ; Abdelsamie, Maged ; Marchezi, Paulo E. ; Nogueira, Ana F. ; Sutter-Fella, Carolin M.

• Document type: Journal article
• Source: ADVANCED ENERGY MATERIALS; v. N/A, p. 14-pg., 2022-06-30.

Abstract

Using in situ photoluminescence measurements during the spin-coating and annealing steps, this study probes the formation of 2D layers on 3D triple cation perovskite films comparing phenylethylammonium and 2-thiophenemethylammonium iodide bulky cations. This study elucidates the formation mechanisms of the surface layers for both cases and reveals two regimes during 2D layer formation: a kinetic-driven and a thermodynamic-driven process. These driving forces result in different compositions of the 2D/3D interface for each treatment, namely, different ratios of pure 2D (n = 1) and quasi-2D (n > 1) structures. This study shows that a higher ratio of quasi-2D phases is more beneficial for device performance, as pure-2D layers may hamper current extraction. Due to a more evenly distributed formation energy profile among 2D and quasi-2D phases, highly concentrated 2-thiophenemethylammonium iodide appears to be more suited for effective surface passivation than its phenylethylammonium analog. (AU)

• FAPESP's process: 21/01357-6 - Hybrid perovskite solar cells investigated in operando by synchrotron radiation techniques
• Grantee: Rodrigo Szostak
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 19/25765-6 - In situ experiments with synchrotron based SAXS and WAXS to probe reactions and formation mechanisms of trending (nanostructured) lead halide materials
• Grantee: Raphael Fernando Moral
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/12582-5 - Perovskites with mixed cations: Relationship between structure, composition, electronic properties and efficiency of solar cells
• Grantee: Rodrigo Szostak
• Support Opportunities: Scholarships in Brazil - Doctorate