Crystalline phase in Alq3 films grown by the hot-wall method

Seto, Shûichi; Yamada, S.; Kitazaki, Asami; Sebald, K.; Rückmann, I.; Gutowski, J.

doi:10.1016/j.jcrysgro.2010.11.120

Cited by 8 publications

(4 citation statements)

References 15 publications

(23 reference statements)

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“…2, we had re-checked the properties of the Alq 3 films deposited at T sub 4120 1C, and confirmed that the molecules in the films deposited at 120 1C and 150 1C exhibited a mer-Alq 3 character. This finding is in agreement with a recent report [15]. Thus, the T sub -dependence of the physical properties of the Alq 3 films deposited at T sub ffi 90-120 1C [14] was not due to the isomeric transformation but could be attributed to the steric effect that the higher thermal energy (for T sub Z120 1C) allowing an adjustment of correct orientation among these complex Alq 3 molecules to form a crystalline phase leads to a change in the activation energy for the adhesion process [16,23,24].…”

Section: Identification Of Mer-alq 3 and Fac-alqsupporting

confidence: 94%

“…However, due to the complexity that Alq 3 molecule has two geometrical isomers, meridional (mer-Alq 3 ) and facial (fac-Alq 3 ), and can aggregate into five different crystalline phases [9][10][11][12], the effect of changing growth conditions on the morphology and the electrical and optical properties of the as-prepared Alq 3 films and nanostructures remains an interesting topic to be investigated [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule

Kao

Lin

Jan

et al. 2012

Journal of Crystal Growth

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Section: Identification Of Mer-alq 3 and Fac-alqsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule

Kao

Lin

Jan

et al. 2012

Journal of Crystal Growth

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“…In the experiment, tris (8‐hydroxyquinoline) aluminum (Alq 3 ), which is an organic low molecular weight material that is widely used as electron transport and light emitting layers in organic light emitting diodes, is used as a solute. In the literature, it has been reported that it is difficult to grow Alq 3 into large thin film single crystals, and needle‐like crystals have been tend to precipitate . The precipitation properties of Alq 3 single crystal using ESD and ionic liquid film were investigated with changing the solution supply rate and thickness of ionic liquid film.…”

Section: Introductionmentioning

confidence: 99%

Proposal of Organic Single Crystal Growth Method Using Electrospray Deposition and Thin‐Film Ionic Liquid

Ueda

Takeuchi

Terada

et al. 2018

Physica Status Solidi (b)

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A novel crystal growth technique is proposed that uses a thin ionic liquid film with an extremely low vapor pressure as the crystal growth field, and a solute supplied by electrospray deposition through the surface of the liquid film. The precipitation properties of small molecule Alq3 single crystals were investigated at 25 °C under atmospheric pressure in a nitrogen atmosphere. Using the proposed method, aggregated small crystals of less than 10 μm, rhombic plate‐like crystals with diagonal lengths of 50 μm, and hexagonal plate‐like crystals of 100 μm were precipitated when the solution supply rates (supply times) were 8.0 (90), 4.0 (180), and 2.0 μl min−1 (360 min), respectively. Alq3 is known to be a material difficult to grow into plate‐like crystals, however, when solution was supplied to the ionic liquid at a rate of 2.0 μl min−1 for 16 h, large hexagonal plate‐like crystals with a diagonal length of about 400 μm are obtained, which are among the largest plate‐like Alq3‐based crystals ever reported. The proposed crystal growth technique is expected to be beneficial for growing large size plate‐like single crystals of various organic materials.

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“…PbI2 films deposited from vapour phase are usually used by a conventional vacuum evaporation. On the other hand, the hot-wall method is known as a high-quality deposition technique for inorganic and organic semiconductor films [8][9][10][11]. The hot-wall method is one of the vapour deposition techniques and can be deposited under a quasi-thermal equilibrium condition [12].…”

Section: Introductionmentioning

confidence: 99%

Conversion of metal-organic halide perovskite from PbI2 precursor films grown by hot-wall method

2018

Self Cite

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Abstract. We report on metal-organic halide perovskite CH3NH3PbI3 films converted from PbI2 precursors for planar heterojunction perovskite solar cells. PbI2 films as a precursor were deposited by hot-wall method and conventional vacuum evaporation. The conversion to perovskite phase from the PbI2 films were performed by annealing in methyl ammonium iodine (MAI) vapour at 120-150 o C. We confirmed that no residual PbI2 phase can be detected in the converted perovskite films by x-ray diffraction measurements. The surface morphology of the perovskite films was measured by AFM. Roughness Ra of the films is 17.8 nm, which is comparable value to the reported ones. Using the converted perovskite films we fabricated tentative perovskite solar cells with a device architecture of ITO/PEDOT:PSS/Perovskite/C60/Ag. The power conversion efficiencies of the fabricated solar cells from a conventional evaporation and the hot-wall method exhibited 2.22 and 2.33%, respectively.

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Crystalline phase in Alq3 films grown by the hot-wall method

Cited by 8 publications

References 15 publications

Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule

Re-condensation and decomposition of Tris(8-hydroxyquinoline)-aluminum in a vapor transport ampoule

Proposal of Organic Single Crystal Growth Method Using Electrospray Deposition and Thin‐Film Ionic Liquid

Conversion of metal-organic halide perovskite from PbI2 precursor films grown by hot-wall method

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