Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes

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Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes
Title:
Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes
Journal Title:
ACS Applied Materials & Interfaces
Publication Date:
23 May 2022
Citation:
Mishra, J. K., Yantara, N., Kanwat, A., Furuhashi, T., Ramesh, S., Salim, T., Jamaludin, N. F., Febriansyah, B., Ooi, Z. E., Mhaisalkar, S., Sum, T. C., Hippalgaonkar, K., & Mathews, N. (2022). Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes. ACS Applied Materials & Interfaces, 14(30), 34238–34246. https://doi.org/10.1021/acsami.2c00899
Abstract:
Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, a thorough study on the roles of additives is essential, especially for blue emissive Pe-LEDs, where the emission is strictly controlled by the n-domain distribution of the Ruddlesden–Popper (RP, L2An–1PbnX3n+1, where L refers to a bulky cation, while A and X are monovalent cation, and halide anion, respectively) perovskite films. Of the various additives that are available, octyl phosphonic acid (OPA) is of immense interest because of its ability to bind with uncoordinated Pb2+ ( notorious for nonradiative recombination) and therefore passivates them. Here, with the help of various spectroscopic techniques, such as X-ray photon-spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence quantum yield (PLQY) measurements, we demonstrate the capability of OPA to bind and passivate unpaired Pb2+ defect sites. Modification to crystallization promoting higher n-domain formation is also observed from steady-state and transient absorption (TA) measurements. With OPA treatment, both the PLQY and EQE of the corresponding PeLED showed improvements up to 53% and 3.7% at peak emission wavelength of 485 nm, respectively.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP14-2014- 03

This research / project is supported by the Ministry of Education - AcRF Tier 2
Grant Reference no. : MOE2019-T2-2-097

This research / project is supported by the Ministry of Education - AcRF Tier 2 grant
Grant Reference no. : MOE-T2EP50120-0004

This research / project is supported by the National Research Foundation - NRF Investigatorship
Grant Reference no. : NRF-NRFI-2018-04
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acsami.2c00899
ISSN:
1944-8252
1944-8244
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