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Title: Molecular design of two-dimensional perovskite cations for efficient energy cascade in perovskite light-emitting diodes
Authors: Nur Fadilah Jamaludin
Febriansyah, Benny
Ng, Yan Fong
Yantara, Natalia
Li, Mingjie
Giovanni, David
Fu, Jianhui
Tay, Yeow Boon
Baikie, Tom
Sum, Tze Chien
Mathews, Nripan
Mhaisalkar, Subodh
Keywords: Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2021
Source: Nur Fadilah Jamaludin, Febriansyah, B., Ng, Y. F., Yantara, N., Li, M., Giovanni, D., Fu, J., Tay, Y. B., Baikie, T., Sum, T. C., Mathews, N. & Mhaisalkar, S. (2021). Molecular design of two-dimensional perovskite cations for efficient energy cascade in perovskite light-emitting diodes. Applied Physics Letters, 119(15), 154101-.
Project: NRF‐CRP14‐2014‐03 
Journal: Applied Physics Letters 
Abstract: Despite extensive reports on highly efficient perovskite light-emitting diodes, rules governing the design of suitable two-dimensional (2D) perovskite templating cation to facilitate formation of optimal emitter landscape for energy cascade remain largely elusive. With factors such as structure, size, functionalization, and charge capable of influencing the distribution of multidimensional perovskite phases, the importance of 2D templating cation design in determining film optoelectronic properties is indisputable. However, typical mono-functionalized 2D templating cations often result in larger lead halide octahedral spacing, which impedes effective charge transport. This has fueled investigation into the use of multiple cations for optimal domain distribution and improved charge transfer kinetics to the emitting species. In this study, we attempt to impart enhanced charge transfer characteristics to the resultant multidimensional perovskite by employing two bi-functionalized aromatic cations, namely, pyridinium ethyl ammonium and imidazolium ethyl ammonium, reminiscent of mono-functionalized phenyl ethyl ammonium, a widely used 2D perovskite templating cation. Although it is proposed that greater intermolecular bonding would enhance charge transfer rates, the simultaneous increase in lead halide octahedral distortion results in quenching of their corresponding 2D and multidimensional perovskite luminescence properties, correlated with increased defect density within the material. This manifests in the form of shorter PL decay lifetimes, lower PLQY, and device performance arising from inferior energy funneling. This study highlights the importance of designing 2D perovskite templating cations offering better transport and reduced octahedral distortion for the development of energy cascade-efficient, multidimensional perovskites.
ISSN: 0003-6951
DOI: 10.1063/5.0061840
DOI (Related Dataset): 10.21979/N9/WDDLG0
Rights: © 2021 Author(s). Published under an exclusive license by AIP Publishing. All rights reserved. This paper was published in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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