Efficient cathode contacts through Ag-doping in multifunctional strong nucleophilic electron transport layer for high performance inverted OLEDs

Yang, Hye In; Jeong, Seung Hye; Cho, Sang Min; Lampande, Raju; Lee, Kyu-Myung; Hong, Jong-Am; Choi, J.S; Kim, Beom-Su; Park, Yongsup; Pode, Ramchandra; Kwon, Jang Hyuk

doi:10.1016/j.orgel.2020.106031

Cited by 13 publications

(7 citation statements)

References 33 publications

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“…4f . Since thermal evaporation enables the formation of smooth and homogeneous thin layers at the nanoscale 37 , the WF downshifts of Al cathodes modified by Ag-doped EILs were nearly saturated when the thickness exceeded 5 nm 23 , 38 (Supplementary Fig. 13 ).…”

Section: Resultsmentioning

confidence: 99%

In situ-formed tetrahedrally coordinated double-helical metal complexes for improved coordination-activated n-doping

Liu

et al. 2022

Nat Commun

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In situ coordination-activated n-doping by air-stable metals in electron-transport organic ligands has proven to be a viable method to achieve Ohmic electron injection for organic optoelectronics. However, the mutual exclusion of ligands with high nucleophilic quality and strong electron affinity limits the injection efficiency. Here, we propose meta-linkage diphenanthroline-type ligands, which not only possess high electron affinity and good electron transport ability but also favour the formation of tetrahedrally coordinated double-helical metal complexes to decrease the ionization energy of air-stable metals. An electron injection layer (EIL) compatible with various cathodes and electron transport materials is developed with silver as an n-dopant, and the injection efficiency outperforms conventional EILs such as lithium compounds. A deep-blue organic light-emitting diode with an optimized EIL achieves a high current efficiency calibrated by the y colour coordinate (0.045) of 237 cd A−1 and a superb LT95 of 104.1 h at 5000 cd m−2.

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Section: Resultsmentioning

confidence: 99%

In situ-formed tetrahedrally coordinated double-helical metal complexes for improved coordination-activated n-doping

Liu

et al. 2022

Nat Commun

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“…2a , where the coordination of organic ligands and metals plays a crucial role in facilitating electron transfer, serving as a significant approach to achieve efficient Ohmic electron injection in organic photoelectrons 25 , 26 . Bipyridines and their derivatives possess heterocyclic structures with preorganized coordination sites for nitrogen, endowing them with strong chelating capabilities and exceptional electron transfer properties 27 , 28 . Therefore, they can readily form coordination complexes with metals, facilitating the release of free electrons due to an irreversible coordination reaction that shifts the equilibrium between metal atoms and cations in favor of the latter 28 , 29 .…”

Section: Resultsmentioning

confidence: 99%

Silver coordination-induced n-doping of PCBM for stable and efficient inverted perovskite solar cells

Gong,

Li,

Wang

et al. 2024

Nat Commun

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The bidirectional migration of halides and silver causes irreversible chemical corrosion to the electrodes and perovskite layer, affecting long-term operation stability of perovskite solar cells. Here we propose a silver coordination-induced n-doping of [6,6]-phenyl-C61-butyric acid methyl ester strategy to safeguard Ag electrode against corrosion and impede the migration of iodine within the PSCs. Meanwhile, the coordination between DCBP and silver induces n-doping in the PCBM layer, accelerating electron extraction from the perovskite layer. The resultant PSCs demonstrate an efficiency of 26.03% (certified 25.51%) with a minimal non-radiative voltage loss of 126 mV. The PCE of resulting devices retain 95% of their initial value after 2500 h of continuous maximum power point tracking under one-sun irradiation, and > 90% of their initial value even after 1500 h of accelerated aging at 85 °C and 85% relative humidity.

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“…Recently, in the presence of chelating ligands, traditional air-stable and inactive metals could also release free electrons by the irreversible coordination reaction to n-dope electrodes, which effectively upshifted work functions (WF) of the cathodes and enhanced electron injection efficiency in OLEDs. 162–168 For example, silver (Ag) and diphenanthroline compounds formed tetrahedrally coordinated double-helical metal complexes during co-evaporation. The coordinated metal complexes shifted the WF of the aluminium (Al) cathode from 3.6 to 3.0 eV, which matched well with the LUMO energy levels of commonly used electron transport molecules.…”

Section: N-type Doping In Organic Optoelectronicsmentioning

confidence: 99%

Efficient and air-stable n-type doping in organic semiconductors

2023

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Efficient cathode contacts through Ag-doping in multifunctional strong nucleophilic electron transport layer for high performance inverted OLEDs

Cited by 13 publications

References 33 publications

In situ-formed tetrahedrally coordinated double-helical metal complexes for improved coordination-activated n-doping

In situ-formed tetrahedrally coordinated double-helical metal complexes for improved coordination-activated n-doping

Silver coordination-induced n-doping of PCBM for stable and efficient inverted perovskite solar cells

Efficient and air-stable n-type doping in organic semiconductors

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