Improved performance of organic light-emitting diodes using advanced hole-transporting materials

Hwang, Seok‐Hwan; Kim, Young Kook; Kwak, Yoonhyun; Lee, Chang-Ho; Lee, Jonghyuk; Kim, Sung‐Chul

doi:10.1016/j.synthmet.2009.09.015

Cited by 8 publications

(7 citation statements)

References 24 publications

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“…The Supporting Information contains full synthetic details and characterization of the four new donor absorber materials; the synthesis and characterization of BF-DPB were previously reported. 26 We also include the single crystal structure data for BF-DPN and BF-DPA in section II of the Supporting Information. Charge carrier mobilities for BF-DPB, BF-DPN, and BF-DPA were comparable (∼10 −4 cm 2 /V-s) as estimated by space-charge limited current measurements shown in Figure S1.…”

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confidence: 99%

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Design of UV-Absorbing Donor Molecules for Nearly Imperceptible Organic Solar Cells

et al. 2021

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Transparent photovoltaic cells are an emerging technology that can provide point-of-use electricity generation for building-integrated applications. While most transparent solar cells to date target absorption of the photon-rich near-infrared portion of the solar spectrum, these devices compromise color neutrality and transparency because of parasitic absorption of long-wavelength visible light. One solution to eliminate parasitic absorption is to employ materials that absorb near-ultraviolet light with sharper absorption cutoffs. Herein, we demonstrate organic donor materials based on N,N′-diaryl-diamines that incorporate a series of aryl linkers to systematically tune their absorption profiles. When paired with acceptor 4,6-bis(3,5-di-4-pyridinylphenyl)-2-methylpyrimidine in an inverted architecture with an indium tin oxide top electrode and an organic optical outcoupling layer, the three best-performing transparent solar cells exhibit average photopic-response-weighted transmittances of 80.3–82.0% and color-rendering indices of 95.0–97.1, both of which are records for organic photovoltaics, with power-conversion efficiencies of 0.43–0.70%.

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confidence: 99%

“…The absorption spectra for the five donor molecules and B4PymPm are presented in Figure 2c. The trend in absorption 26 and studied in CT-OLEDs and solar cells. 19 onsets correlates with the size of the linker across the five donors; that is, the larger the linker, the smaller the optical gap.…”

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Design of UV-Absorbing Donor Molecules for Nearly Imperceptible Organic Solar Cells

et al. 2021

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“…48 Hwang et al have replaced the πlinker of biphenyl with phenylnaphthyl to produce a diarylamine functionalized HTM, displaying an increased T g from 121 to 159 °C. 50 Tang and co-workers have shown that the π-linker alteration from biphenyl to tetraphenylethene in diarylamine-based HTMs can increase T g by 51 °C. 53 However, the resultant high T g molecular semiconductors have to be processed into thin films by vacuum deposition, owing to low solubility.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Apart from the structural factors such as the rigidity of the conjugated unit ,− and the length of substituting group, − the π-extension ,,− has already been identified as an effective method to boost the T g s of traditional molecular semiconductors. For instance, Shirota et al have used thiophene, dithiophene, trithiophene, and tetrathiophene as π-linkers to synthesize four HTMs, showing gradually increased T g s up to 98 °C .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Shirota et al have used thiophene, dithiophene, trithiophene, and tetrathiophene as π-linkers to synthesize four HTMs, showing gradually increased T g s up to 98 °C . Hwang et al have replaced the π-linker of biphenyl with phenylnaphthyl to produce a diarylamine functionalized HTM, displaying an increased T g from 121 to 159 °C . Tang and co-workers have shown that the π-linker alteration from biphenyl to tetraphenylethene in diarylamine-based HTMs can increase T g by 51 °C .…”

Section: Introductionmentioning

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A Pyrrole-Bridged Bis(oxa[5]helicene)-Based Molecular Semiconductor for Efficient and Durable Perovskite Solar Cells: Microscopic Insights

Wei

Zheng

Xie

et al. 2021

ACS Materials Lett.

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Exotic organic semiconductors based on helicenes are attractive because of their peculiar topology-related optoelectronic properties and good solution-processability. We herein construct pyrrole-bridged bis(oxa[5]helicene) and further employ it as the π-linker of a solution-processable molecular semiconductor (DOP-OMeDPA) with improved hole mobility and glass transition temperature compared with its oxa[5]helicene counterpart. A solution-processed, doped semiconducting composite of DOP-OMeDPA presents high conductivity and slow interfacial charge recombination in perovskite solar cells, enabling the fabrication of thermostable devices with 21.3% efficiency. The DOP-OMeDPA-based thin film exhibits excellent morphology stability at 60 °C and remarkably attenuates the thermal decomposition of perovskite. Molecular dynamics modeling uncovers the microscopic origin of glass transition, that is, the torsional vibration of electron-donor for pristine materials, compared with the translational motion of molecules in doped ones.

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Solution-processable hole-transporting materials for organic light-emitting diodes

Xu,

Lin

2024

Solution-Processed Organic Light-Emitting Devices

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Improved performance of organic light-emitting diodes using advanced hole-transporting materials

Cited by 8 publications

References 24 publications

Design of UV-Absorbing Donor Molecules for Nearly Imperceptible Organic Solar Cells

Design of UV-Absorbing Donor Molecules for Nearly Imperceptible Organic Solar Cells

A Pyrrole-Bridged Bis(oxa[5]helicene)-Based Molecular Semiconductor for Efficient and Durable Perovskite Solar Cells: Microscopic Insights

Solution-processable hole-transporting materials for organic light-emitting diodes

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