The regulatory effect of triphenylphosphine oxide on perovskites for morphological and radiative improvement

Jiang, Danyang; Jiang, Tao; Tian, Yuee; Wen, Kaichuan; Duan, Chunbo; Wang, Nana; Li, Qiang; Wang, Jianpu; Xu, Hui

doi:10.1039/d1tc01320c

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…This suggests a stabilizing effect of the PO group on the surface of PbBr 6 4− octahedral unit, which plays a major role in surface passivation. [ 45 ] To sum up, from the 31 P NMR and XPS results, we conclude that a PPT/PPF layer is successfully spin‐coated onto the perovskite film after post‐treatment and that the PO groups of phosphine oxides thereby coordinate with surface defects and vacancies, as portrayed in Figure 2e. Moreover, due to the preferable coordination between the P = O group and the Pb 2+ ion, the passivation effect primarily stems from the coordination between them, which is consistent with the reported literatures.…”

Section: Resultsmentioning

confidence: 85%

Realizing High Brightness Quasi‐2D Perovskite Light‐Emitting Diodes with Reduced Efficiency Roll‐Off via Multifunctional Interface Engineering

et al. 2023

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Quasi‐2D perovskites have recently flourished in the field of luminescence due to the quantum‐confinement effect and the efficient energy transfer between different n phases resulting in exceptional optical properties. However, owing to the lower conductivity and poor charge injection, quasi‐2D perovskite light‐emitting diodes (PeLEDs) typically suffer from low brightness and high‐efficiency roll‐off at high current densities compared to 3D perovskite‐based PeLEDs, which is undoubtedly one of the most critical issues in this field. In this work, quasi‐2D PeLEDs with high brightness, reduced trap density, and low‐efficiency roll‐off are successfully demonstrated by introducing a thin layer of conductive phosphine oxide at the perovskite/electron transport layer interface. The results surprisingly show that this additional layer does not improve the energy transfer between multiple quasi‐2D phases in the perovskite film, but purely improves the electronic properties of the perovskite interface. On the one hand, it passivates the surface defects of the perovskite film; on the other hand, it promotes electron injection and prevents hole leakage across this interface. As a result, the modified quasi‐2D pure Cs‐based device shows a maximum brightness of > 70,000 cd m−2 (twice that of the control device), a maximum external quantum efficiency (EQE) of > 10% and a much lower efficiency roll‐off at high bias voltages.

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Section: Resultsmentioning

confidence: 85%

Realizing High Brightness Quasi‐2D Perovskite Light‐Emitting Diodes with Reduced Efficiency Roll‐Off via Multifunctional Interface Engineering

et al. 2023

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Compositional optimization of mixed cation Dion–Jacobson perovskites for efficient green light emission

et al. 2022

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The regulatory effect of triphenylphosphine oxide on perovskites for morphological and radiative improvement

Abstract: The influence of a triphenylphosphine oxide (TPPO) additive on the morphology and emission of FAPbBr3 perovskites is investigated by transient and temperature-dependent emission spectra, which indicates the defect passivation through P=O coordination.

Cited by 2 publications

References 43 publications

Realizing High Brightness Quasi‐2D Perovskite Light‐Emitting Diodes with Reduced Efficiency Roll‐Off via Multifunctional Interface Engineering

Realizing High Brightness Quasi‐2D Perovskite Light‐Emitting Diodes with Reduced Efficiency Roll‐Off via Multifunctional Interface Engineering

Compositional optimization of mixed cation Dion–Jacobson perovskites for efficient green light emission

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