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24 Aug 2009

Volume 95, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 95, 082507 (2009); http://dx.doi.org/10.1063/1.3186782 (3 pages)

Sang-Koog Kim, Ki-Suk Lee, and Dong-Soo Han
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Substrate dependent charge injection at the V2O5/organic interface

M. G. Helander, Z. B. Wang, M. T. Greiner, J. Qiu, and Z. H. Lu

Appl. Phys. Lett. 95, 083301 (2009); http://dx.doi.org/10.1063/1.3213553 (3 pages) | Cited 6 times

Online Publication Date: 26 August 2009

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Charge injection at the interface between V2O5 and N,N′-diphenyl-N,N′-bis-(1-naphthyl)-1-1′-biphenyl-4,4′-diamine (α-NPD) was studied. It is found that the energy-level alignment at the V2O5/α-NPD is dependent on the underlying substrate, in contrast to previous reports. This phenomenon is consistent with interface dipole theory for weakly pinning interfaces. V2O5 is found to weakly pin the Fermi level, such that the underlying substrate still influences the dipole between V2O5 and α-NPD. The charge neutrality level of V2O5 is also found to be 5.35 eV.
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68.35.Ct Interface structure and roughness
71.20.Ps Other inorganic compounds
73.40.-c Electronic transport in interface structures
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Low-temperature electronic structures and intramolecular interaction of oligofluorenes studied by synchrotron photoemission spectroscopy

Guan-Ru Lee, Yu-Hung Chen, Chang-Ting Lin, Chih-I Wu, Tun-Wen Pi, Chung-Chih Wu, and Ken-Tsung Wong

Appl. Phys. Lett. 95, 083302 (2009); http://dx.doi.org/10.1063/1.3213548 (3 pages)

Online Publication Date: 27 August 2009

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Influences of temperature and intramolecular interaction on the electronic structures of oligofluorenes were systematically studied via synchrotron radiation photoemission spectroscopy and quantum chemical calculations. Our results show that the oligofluorene thin films deposited at substrates of different temperatures will alter the electronic structures, which results from the change of interunit angles in 2,7-bis[9,9-di(4-methylphenyl)-fluoren-2-yl]-9,9-di(4-methylphenyl)fluorine molecules. The fluorene-units at low temperature are almost perpendicular to each other and the interunit angle of stable state is 41° at room temperature.
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71.20.Rv Polymers and organic compounds
79.60.Fr Polymers; organic compounds
68.55.-a Thin film structure and morphology
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Publisher's Note: “Quinoxaline-based π-conjugated donor polymer for highly efficient organic thin-film solar cells” [Appl. Phys. Lett. 95, 053701 (2009)]

Daisuke Kitazawa, Nobuhiro Watanabe, Shuhei Yamamoto, and Jun Tsukamoto

Appl. Phys. Lett. 95, 083303 (2009); http://dx.doi.org/10.1063/1.3216534 (1 page)

Online Publication Date: 28 August 2009

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Abstract Unavailable
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84.60.Jt Photoelectric conversion
71.20.Rv Polymers and organic compounds
71.55.Ht Other nonmetals
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
99.10.Fg Publisher's note
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