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13 Aug 2012

Volume 101, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 101, 071104 (2012); http://dx.doi.org/10.1063/1.4742749 (4 pages)

Judson D. Ryckman and S. M. Weiss
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Influence of the spatial photocarrier generation profile on the performance of organic solar cells

Jan Mescher, Nico Christ, Siegfried Kettlitz, Alexander Colsmann, and Uli Lemmer

Appl. Phys. Lett. 101, 073301 (2012); http://dx.doi.org/10.1063/1.4745601 (4 pages) | Cited 1 time

Online Publication Date: 13 August 2012

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We investigate the impact of the interplay of charge carrier drift and diffusion on the fill factor of organic solar cells. Thin film interferences lead to strong gradients in the photocarrier generation profile. By means of numerical simulations, we show that the shape of the absorption profile is crucial for the efficiency of organic solar cells. High absorption in the peripheral areas of the active layer advantages an unfavorable diffusion current which leads to a reduction of the fill factor. Our work suggests design rules for the optical optimization of organic solar cells.
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88.40.hj Efficiency and performance of solar cells
88.40.jr Organic photovoltaics
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Balanced charge carrier mobilities in bulk heterojunction organic solar cells

Mamatimin Abbas and Nalan Tekin

Appl. Phys. Lett. 101, 073302 (2012); http://dx.doi.org/10.1063/1.4745602 (4 pages) | Cited 3 times

Online Publication Date: 13 August 2012

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All solution processed ambipolar bulk heterojunction organic field effect transistors were fabricated using Au and Al as hole and electron injection contacts to study both types of charge carrier mobilities in a single device. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) were mixed with different ratios. Well balanced electron and hole mobilities were obtained at 1:0.3 ratio. Organic solar cells with the same ratio yielded draft enhancement in device performance parameters, indicating optimized carrier transport in the bulk of solar cell devices.
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88.40.jp Multijunction solar cells
88.40.jr Organic photovoltaics
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Polyvinylpyrrolidone-modified indium tin oxide as an electron-collecting electrode for inverted polymer solar cells

J. W. Shim, H. Cheun, J. Meyer, C. Fuentes-Hernandez, A. Dindar, Y. H. Zhou, D. K. Hwang, A. Kahn, and B. Kippelen

Appl. Phys. Lett. 101, 073303 (2012); http://dx.doi.org/10.1063/1.4745772 (4 pages) | Cited 3 times

Online Publication Date: 13 August 2012

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We report on the photovoltaic properties of inverted polymer solar cells that use a polyvinylpyrrolidone (PVP) modified indium tin oxide (ITO) layer as the electron-collecting electrode. An ultrathin PVP layer, prepared by spin-coating, on top of ITO, was used to induce a reduction of its work function, allowing it to act as an electron-collecting electrode. Devices made on pristine ITO showed s-shape current-voltage characteristics, which were removed after exposure to ultraviolet radiation due to a reduction of the work function of ITO. Inverted solar cells with ITO/PVP electrodes yield efficiencies comparable to devices with ITO/ZnO electron-selective electrodes.
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88.40.jr Organic photovoltaics
65.40.gh Work functions
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Probing buried organic layers in organic light-emitting diodes under operation by electric-field-induced doubly resonant sum-frequency generation spectroscopy

T. Miyamae, N. Takada, and T. Tsutsui

Appl. Phys. Lett. 101, 073304 (2012); http://dx.doi.org/10.1063/1.4746273 (4 pages) | Cited 1 time

Online Publication Date: 15 August 2012

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Electric-field-induced doubly resonant sum-frequency generation (EFI-DR-SFG) spectroscopy was used to study the electric field distribution in multilayer organic light-emitting diodes (OLEDs). Remarkable correlations between the DR-SFG signal enhancement and the applied bias voltage were observed. The SFG signals attributed to 4,4′-bis[N-(1-naphthyl-N-phenylamino)-biphenyl] were significantly enhanced by applying a forward voltage, whereas those from Alq3 were increased by applying a reverse voltage. The large enhancement in EFI-DR-SFG intensity enables us to nondestructively probe the local electric field distribution at the buried organic layer within the OLED.
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85.60.Jb Light-emitting devices
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