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27 Jul 2009

Volume 95, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 95, 043110 (2009); http://dx.doi.org/10.1063/1.3184784 (3 pages)

Felix Loske and Angelika Kühnle
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Enhanced open-circuit voltage in polymer solar cells

Jie Luo (罗洁), Hongbin Wu (吴宏滨), Chao He (贺超), Aiyuan Li (李爱源), Wei Yang (杨伟), and Yong Cao (曹镛)

Appl. Phys. Lett. 95, 043301 (2009); http://dx.doi.org/10.1063/1.3157278 (3 pages) | Cited 36 times

Online Publication Date: 27 July 2009

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We reported that the open-circuit voltage (VOC) of polymer solar cells (PSCs) can be enhanced by 0.3 V via inserting a thin layer of alcohol/water-soluble polyelectrolyte between the active layer and metal electrode. The origin of the increase in VOC can be attributed to the superposition of the built-in field with the interfacial dipole of the interlayer, and the existence of the interlayer as a dielectric was confirmed by ac impedance spectroscopy. The significant enhancement in VOC and the simplicity of incorporation of interlayer by solution processing make this method a good candidate for further enhancing the performance of PSCs.
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84.60.Jt Photoelectric conversion
82.45.Gj Electrolytes
82.45.Wx Polymers and organic materials in electrochemistry
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Energy-level alignment and charge injection at metal/C60/organic interfaces

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

Appl. Phys. Lett. 95, 043302 (2009); http://dx.doi.org/10.1063/1.3189176 (3 pages) | Cited 11 times

Online Publication Date: 27 July 2009

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The energy-level alignment and charge injection at metal/C60/organic interfaces have been studied by ultraviolet photoelectron spectroscopy and temperature dependent current-voltage (IV) measurements. It is found that the Fermi level at the interface is pinned to ∼ 4.7 eV by adsorbed C60 molecules on the metal surface, resulting in more favorable energy level alignment for charge injection. The findings are in excellent agreement with interface dipole theory derived from traditional semiconductor physics.
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73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
68.43.Mn Adsorption kinetics
79.60.Jv Interfaces; heterostructures; nanostructures
68.55.jd Thickness
73.30.+y Surface double layers, Schottky barriers, and work functions
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Study of molecular spin-crossover complex Fe(phen)2(NCS)2 thin films

S. Shi, G. Schmerber, J. Arabski, J.-B. Beaufrand, D. J. Kim, S. Boukari, M. Bowen, N. T. Kemp, N. Viart, G. Rogez, E. Beaurepaire, H. Aubriet, J. Petersen, C. Becker, and D. Ruch

Appl. Phys. Lett. 95, 043303 (2009); http://dx.doi.org/10.1063/1.3192355 (3 pages) | Cited 11 times

Online Publication Date: 29 July 2009

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We report on the growth by evaporation under high vacuum of high-quality thin films of Fe(phen)2(NCS)2 (phen = 1,10-phenanthroline) that maintain the expected electronic structure down to a thickness of 10 nm and that exhibit a temperature-driven spin transition. We have investigated the current-voltage characteristics of a device based on such films. From the space charge-limited current regime, we deduce a mobility of 6.5×10−6 cm2/V s that is similar to the low-range mobility measured on the widely studied tris(8-hydroxyquinoline)aluminum organic semiconductor. This work paves the way for multifunctional molecular devices based on spin-crossover complexes.
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73.61.Ph Polymers; organic compounds
85.65.+h Molecular electronic devices
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
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Facile construction of nanofibrous ZnO photoelectrode for dye-sensitized solar cell applications

Wei Zhang, Rui Zhu, Xizhe Liu, Bin Liu, and Seeram Ramakrishna

Appl. Phys. Lett. 95, 043304 (2009); http://dx.doi.org/10.1063/1.3193661 (3 pages) | Cited 24 times

Online Publication Date: 31 July 2009

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A facile method to prepare nanofibrous ZnO photoelectrodes with tunable thicknesses by electrospinning is reported. A “self-relaxation layer” is formed spontaneously between ZnO nanofibers and fluorine-doped SnO2 (FTO) substrate, which facilitates the release of interfacial tensile stress during calcination, resulting in good adhesion of ZnO film to FTO substrate. Dye-sensitized solar cells (DSSCs) based on the nanofibrous ZnO photoelectrodes are fabricated and an energy conversion efficiency of 3.02% is achieved under irradiation of AM 1.5 simulated sunlight with a power density of 100 mW cm−2, which shows good promise of electrospun nanofibrous ZnO as the photoelectrode in DSSCs.
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84.60.Jt Photoelectric conversion
82.45.Fk Electrodes
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