A high T g small-molecule arylamine derivative as a doped hole-injection/transport material for stable organic light-emitting diodes

Huang, Xiao-Lan; Zou, Jianhua; Liu, Jun-Zhe; Jin, Guang He; Li, Jianbin; Yao, Sheng-Lin; Peng, Junbiao; Cao, Yong; Zhu, Xu‐Hui

doi:10.1016/j.orgel.2018.04.012

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…At a certain section of the current density–voltage ( J – V ) curve, the J shows a lucid quadratic dependence on the V , marking the SCLC region. By fitting the SCLC region according to the Mott–Gurney law, the mobility values of CJ-03 , CJ-04 , and spiro-OMeTAD (dopant-free) are deduced to be 6.47 × 10 –5 , 9.66 × 10 –5 , and 9.79 × 10 –5 cm 2 V –1 s –1 , respectively (Figures S26–S28, Supporting Information). The hole mobility of CJ-04 performs at the same level as spiro-OMeTAD and is higher than that of CJ-03 .…”

Section: Resultsmentioning

confidence: 99%

Tetraphenylbutadiene-Based Symmetric 3D Hole-Transporting Materials for Perovskite Solar Cells: A Trial Trade-off between Charge Mobility and Film Morphology

Chen

Xia

Gao

et al. 2020

ACS Appl. Mater. Interfaces

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Two three-dimensional symmetric tetraphenylbutadiene derivatives decorated with diphenylamine or triphenylamine fragments are first prepared for use as hole-transporting materials (HTMs) in perovskite solar cells (PSCs). The HTMs are acquired using straightforward synthetic methods and facile purification techniques. The thermal stability, photophysical properties, electrochemical behaviors, computational study, hole mobility, X-ray diffraction, hole transfer dynamics, hydrophobicity, surface morphology, and photovoltaic performances of the HTMs are discussed. The highest power conversion efficiency (PCE) of CJ-04-based cell is 13.75%, which is increased to 20.06% when CJ-03 is used as HTM, superior to the PCE of the cell based on 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) (18.90%). The preparation cost of CJ-03 accounts for merely 23.1% of the price of commercial spiro-OMeTAD, while the concentration of CJ-03 solution used in the device fabrication (60.0 mg mL–1) is lower compared with that of the spiro-OMeTAD solution (72.3 mg mL–1). These results corroborate that the screw-like HTMs with a highly distorted configuration are facilely available and promising candidates for PSCs. More importantly, a practical solution is proposed to achieve moderate charge mobility and good film-formation ability of the HTMs simultaneously.

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Section: Resultsmentioning

confidence: 99%

Tetraphenylbutadiene-Based Symmetric 3D Hole-Transporting Materials for Perovskite Solar Cells: A Trial Trade-off between Charge Mobility and Film Morphology

Chen

Xia

Gao

et al. 2020

ACS Appl. Mater. Interfaces

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“…While the T g for spiro-OMeTAD is reported to be higher (124 °C), crystallization from concentrated solutions at room temperature has been observed, suggesting that the T g might be lower in practice. 37 The higher T g for this set of HTMs is attributed to increased molecular weight 32,33,38 and replacement of anisole with more rigid fluorene and carbazole moieties. 37 Cyclic voltammetric analysis of each pristine HTM shows good oxidation reversibility (Figure S4).…”

mentioning

confidence: 87%

Thermally Stable Perovskite Solar Cells by Systematic Molecular Design of the Hole-Transport Layer

Schloemer¹,

Gehan

Christians

et al. 2019

ACS Energy Lett.

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With metal halide perovskite solar cells (PSCs) now reaching device efficiencies >23%, more emphasis must now shift toward addressing their device stability. Recently, a triarylamine-based organic hole-transport material (HTM) doped with its oxidized salt analogue (EH44/EH44-ox) led to unencapsulated PSCs with high stability in ambient conditions. Here we report criteria for triarylamine-based organic HTMs formulated with stable oxidized salts as hole-transport layer (HTL) for increased PSC thermal stability. The triarylamine-based dopants must contain at least two para-electron-donating groups for radical cation stabilization to prevent impurity formation that leads to reduced PSC performance. The stability of unencapsulated devices prepared using these new HTMs stressed under constant load and illumination far outperforms that of both EH44/EH44-ox and Li+-doped spiro-OMeTAD controls at 50 °C. Furthermore, the ability to mix and match these dopants with a nonidentical small-molecule-based HTL matrix broadens the design scope for highly stable and cost-effective PSCs without sacrificing performance.

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“…Xiao-Lan Huang et al reported the use of a simple small-molecule organic HIL known as N,N,N′,N′-tetra(4-methoxyphenyl)[2,2′-binaphthalene]-6,6′-diamine for OLEDs. When the material doped with F4-TCNQ, the HOMO level increased from 4.68 eV to 5.27 eV, enhancing the hole conductivity up to 2.64 × 10 −4 S m −1 compared to the neat film of 1.68 × 10 −4 S m −1 [ 18 ].…”

Section: Hole Injection Layer Materialsmentioning

confidence: 99%

The Optimization of Hole Injection Layer in Organic Light-Emitting Diodes

Xing,

Wu,

Sun

et al. 2024

Nanomaterials

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Organic light-emitting diodes (OLEDs) are widely recognized as the forefront technology for displays and lighting technology. Now, the global OLED market is nearly mature, driven by the rising demand for superior displays in smartphones. In recent years, numerous strategies have been introduced and demonstrated to optimize the hole injection layer to further enhance the efficiency of OLEDs. In this paper, different methods of optimizing the hole injection layer were elucidated, including using a suitable hole injection material to minimize the hole injection barrier and match the energy level with the emission layer, exploring new preparation methods to optimize the structure of hole injection layer, and so on. Meanwhile, this article can help people to understand the current research progress and the challenges still faced in relation to the hole injection layer in OLEDs, providing future research directions to enhance the properties of OLEDs.

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A high T g small-molecule arylamine derivative as a doped hole-injection/transport material for stable organic light-emitting diodes

Cited by 13 publications

References 37 publications

Tetraphenylbutadiene-Based Symmetric 3D Hole-Transporting Materials for Perovskite Solar Cells: A Trial Trade-off between Charge Mobility and Film Morphology

Tetraphenylbutadiene-Based Symmetric 3D Hole-Transporting Materials for Perovskite Solar Cells: A Trial Trade-off between Charge Mobility and Film Morphology

Thermally Stable Perovskite Solar Cells by Systematic Molecular Design of the Hole-Transport Layer

The Optimization of Hole Injection Layer in Organic Light-Emitting Diodes

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