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17 Aug 2009

Volume 95, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 95, 073703 (2009); http://dx.doi.org/10.1063/1.3152768 (3 pages)

Mohammud R. Noor, Swati Goyal, Shawn M. Christensen, and Samir M. Iqbal
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Electrical conductance of single C60 and benzene molecules bridging between Pt electrode

Manabu Kiguchi

Appl. Phys. Lett. 95, 073301 (2009); http://dx.doi.org/10.1063/1.3204466 (3 pages) | Cited 13 times

Online Publication Date: 17 August 2009

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The electrical conductance of single C60 and benzene molecules bridging between Pt electrodes was investigated at room temperature in ultrahigh vacuum. The conductance of the Pt/C60/Pt junction was 0.7 G0(2e2/h), which was close to that of the metal atomic contact. The single C60 molecular junction showed a high and fixed conductance value, by the direct binding of the C60 to the Pt electrodes without using anchoring group. The conductance of the Pt/C60/Pt junction decreased and its stability increased with the amount of deposited C60 molecule, which could be explained by the C60 adsorption on the stem part of the electrode. In contrast with the Pt/C60/Pt junction, the Pt/benzene/Pt junction did not show a fixed conductance value, reflecting the planar molecular shape.
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73.40.Rw Metal-insulator-metal structures
68.43.Fg Adsorbate structure (binding sites, geometry)
85.65.+h Molecular electronic devices
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Photopatternable ultrathin gate dielectrics for low-voltage-operating organic circuits

Jaeyoung Jang, Se Hyun Kim, Jihun Hwang, Sooji Nam, Chanwoo Yang, Dae Sung Chung, and Chan Eon Park

Appl. Phys. Lett. 95, 073302 (2009); http://dx.doi.org/10.1063/1.3206665 (3 pages) | Cited 5 times

Online Publication Date: 18 August 2009

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We report here a photopatternable ultrathin gate dielectric for the fabrication of low-voltage-operating organic field-effect transistors (OFETs) and inverters. The gate dielectric material is composed of a photocrosslinkable polymer, poly(vinyl cinnamate), and a thermally crosslinkable silane crosslinking reagent, 1,6-bis(trichlorosilyl)hexane. The spin-coated dielectric is photocured with ultraviolet light, which enables fine film patterning via regular photolithography. After thermal curing (at 110 °C), the dielectric showed excellent insulating properties (a leakage current density of ≈ 10−7 A/cm2 at 2.0 MV/cm) for an ultrathin film thickness of 70 nm, thus reducing the operating voltage of the OFETs and inverters to −5 V.
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85.30.Tv Field effect devices
84.30.Jc Power electronics; power supply circuits
85.40.Hp Lithography, masks and pattern transfer
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Control of the molecular orientation of a 2,2′-bithiophene-9,9-dioctylfluorene copolymer by laser annealing and subsequent enhancement of the field effect transistor characteristics

Korefumi Kubota, Takuji Kato, and Chihaya Adachi

Appl. Phys. Lett. 95, 073303 (2009); http://dx.doi.org/10.1063/1.3211125 (3 pages) | Cited 2 times

Online Publication Date: 20 August 2009

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We controlled the orientation of a 2,2′-bithiophene-9,9-dioctylfluorene (F8T2) copolymer spin-coated film on a polycarbonate substrate using a laser-annealing technique and demonstrated an enhancement of the field-effect transistor characteristics. We used a semiconductor laser, having a lasing wavelength of λ = 405 nm, with a small spot size of 400 nm. Using polarizing optical microscopy and x-ray diffraction analysis, we confirmed enhancement of the orientation of the molecular chains of F8T2, along the laser scanning direction. Following laser annealing, the field-effect hole mobility resulted in a value of μ = 1.6×10−3 cm2/V s, which is about three times higher than that of the unannealed sample.
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61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
68.15.+e Liquid thin films
61.72.Cc Kinetics of defect formation and annealing
85.30.Tv Field effect devices
61.30.Vx Polymer liquid crystals
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Space charge effects on the electroluminescence efficiency and stability of organic light-emitting devices with mixed emitting layers

Yichun Luo and Hany Aziz

Appl. Phys. Lett. 95, 073304 (2009); http://dx.doi.org/10.1063/1.3210790 (3 pages) | Cited 7 times

Online Publication Date: 21 August 2009

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In organic light-emitting devices (OLEDs), the decay rate of triplet state population in the electron/hole recombination zone is found to be highly sensitive to space charge densities, providing an avenue for inferring variations in their formation. In OLEDs containing mixtures of N,N′-Bis(naphthalen-1-yl)-N′-bis(phenyl)benzidine (NPB) and tris(8-hydroxyquinoline) aluminum (AlQ3) in the emitting layer, optimizing the NPB/AlQ3 is found to reduce hole space charges, and leads to an increase in electroluminescence stability. Conversely, electroluminescence efficiency is found to be only weakly dependent on the mixture composition, suggesting that hole space charges are not effective quenchers of AlQ3 singlet excitons in mixed emitting layer OLEDs.
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85.60.Jb Light-emitting devices
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.35.-y Excitons and related phenomena
77.22.Jp Dielectric breakdown and space-charge effects
78.60.Fi Electroluminescence
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