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1 Oct 2012

Volume 101, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 101, 141101 (2012); http://dx.doi.org/10.1063/1.4742864 (4 pages)

Po-Hsun Huang, Michael Ian Lapsley, Daniel Ahmed, Yuchao Chen, Lin Wang, and Tony Jun Huang
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Enhanced photocurrent and open-circuit voltage in a 3-layer cascade organic solar cell

Kjell Cnops, Barry P. Rand, David Cheyns, and Paul Heremans

Appl. Phys. Lett. 101, 143301 (2012); http://dx.doi.org/10.1063/1.4757575 (4 pages) | Cited 5 times

Online Publication Date: 2 October 2012

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We demonstrate a cascade architecture for organic solar cells with two planar donor/acceptor (DA) heterojunctions operating in series. In a 3-layered structure, subphthalocyanine (SubPc) acts as an ambipolar interlayer between a tetracene (Tc) donor and a C60 acceptor. The Tc/SubPc and SubPc/C60 interfaces are both able to contribute to the photocurrent, which results in a short-circuit current in the 3-layer cascade cell larger than in any of the constituent bi-layer DA combinations. Furthermore, the open-circuit voltage is increased due to reduced recombination losses at the DA interface.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Thickness dependent effects of an intermediate molecular blocking layer on the optoelectronic characteristics of organic bilayer photovoltaic cells

A. Steindamm, M. Brendel, A. K. Topczak, and J. Pflaum

Appl. Phys. Lett. 101, 143302 (2012); http://dx.doi.org/10.1063/1.4757297 (4 pages)

Online Publication Date: 3 October 2012

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In this work, we address the microscopic effects related to the implementation of a bathophenanthroline (BPhen) exciton blocking layer (EBL) sandwiched between Ag cathode and molecular diindenoperylene (DIP)/C60 bilayer of a photovoltaic cell. Complementary studies of current density, external quantum efficiency, and photoluminescence quenching for EBL thicknesses up to 50 nm indicate that Ag atoms are able to penetrate through the whole 35 nm thick C60 film into the polycrystalline DIP layer underneath, thereby enhancing exciton quenching if no blocking layer is applied. In contrast, an optimal trade-off between exciton blocking, suppression of metal penetration, and electron transport is achieved for a 5 nm thick BPhen layer yielding an improvement of power conversion efficiency by more than a factor of 2.
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85.60.Bt Optoelectronic device characterization, design, and modeling
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Doped polymer electrodes for high performance ferroelectric capacitors on plastic substrates

M. A. Khan, Unnat S. Bhansali, X. X. Zhang, Moussa M. Saleh, Ihab Odeh, and H. N. Alshareef

Appl. Phys. Lett. 101, 143303 (2012); http://dx.doi.org/10.1063/1.4757426 (5 pages)

Online Publication Date: 3 October 2012

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Flexible ferroelectric capacitors with doped polymer electrodes have been fabricated on plastic substrates with performance as good as metal electrodes. The effect of doping on the morphology of polymer electrodes and its impact on device performance have been studied. Improved fatigue characteristics using doped and undoped poly (3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) electrodes versus metal electrodes are observed. It is shown that the polymer electrodes follow classical ferroelectric and dielectric responses, including series resistance effects. The improved device characteristics obtained using highly conducting doped PEDOT:PSS suggest that it may be used both as an electrode and as global interconnect for all-polymer transparent circuits on flexible substrates.
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84.32.Tt Capacitors
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
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Analysis of the external and internal quantum efficiency of multi-emitter, white organic light emitting diodes

Mauro Furno, Thomas C. Rosenow, Malte C. Gather, Björn Lüssem, and Karl Leo

Appl. Phys. Lett. 101, 143304 (2012); http://dx.doi.org/10.1063/1.4757610 (4 pages) | Cited 1 time

Online Publication Date: 5 October 2012

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We report on a theoretical framework for the efficiency analysis of complex, multi-emitter organic light emitting diodes (OLEDs). The calculation approach makes use of electromagnetic modeling to quantify the overall OLED photon outcoupling efficiency and a phenomenological description for electrical and excitonic processes. From the comparison of optical modeling results and measurements of the total external quantum efficiency, we obtain reliable estimates of internal quantum yield. As application of the model, we analyze high-efficiency stacked white OLEDs and comment on the various efficiency loss channels present in the devices.
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85.60.Jb Light-emitting devices
85.30.De Semiconductor-device characterization, design, and modeling
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