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7 Nov 2011

Volume 99, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 99, 193101 (2011); http://dx.doi.org/10.1063/1.3657777 (3 pages)

Sungwook Chung, Jonathan R. Felts, Debin Wang, William P. King, and James J. De Yoreo
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Enhancement of photovoltaic efficiency of phosphor doped organic solar cell by energy and electron transfer from the phosphor to C60 acceptor

Dongfang Yang, Wenlian Li, Bei Chu, Zisheng Su, Junbo Wang, Guang Zhang, and Feng Zhang

Appl. Phys. Lett. 99, 193301 (2011); http://dx.doi.org/10.1063/1.3658875 (3 pages) | Cited 2 times

Online Publication Date: 7 November 2011

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About 67% increase in power conversion efficiency (PCE) of copper phthalocyanine/C60 based organic solar cells was demonstrated by doping 4 wt % iridium(III)bis(3-(2-benzothiazolyl)-7-(diethylamino)-2H-1-benzopyran-2-onato-N’,C4)(acetyl acetonate) (IrC6) into C60 acceptor layer. The raised PCE was proved to result from the efficient photo absorption of IrC6 followed by the energy and electron transfer from IrC6 to C60 due to the matched energy level alignment between these two species. Besides, IrC6 could also increase the exciton dissociation efficiency at the active interface of the solar cells. The more detail improvement mechanisms were also discussed.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Electrical characteristics and operating mechanisms of nonvolatile memory devices fabricated utilizing core-shell CuInS2-ZnS quantum dots embedded in a poly(methyl methacrylate) layer

Kyu Wan Han, Min Ho Lee, Tae Whan Kim, Dong Yeol Yun, Sung Woo Kim, and Sang Wook Kim

Appl. Phys. Lett. 99, 193302 (2011); http://dx.doi.org/10.1063/1.3659473 (3 pages) | Cited 2 times

Online Publication Date: 7 November 2011

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Nonvolatile memory devices were fabricated with core-shell CuInS2-ZnS quantum dots (QDs) embedded in poly(methyl methacrylate) (PMMA). Capacitance-voltage (C-V) measurements at 300 K on the Al/CuInS2-ZnS QDs embedded in PMMA layer/p-Si device showed capacitance hysteresis behaviors with a flatband voltage shift. The memory window of the device increased with increasing applied sweep voltage and saturated at high electric fields due to the current leakage. Capacitance-time measurements showed that the retention time was larger than 1 × 105 s that was more than 10 years. The operating mechanisms for the devices are described on the basis of the C-V curves.
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85.30.-z Semiconductor devices
84.30.Sk Pulse and digital circuits
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Influence of surface morphology evolution of SubPc layers on the performance of SubPc/C60 organic photovoltaic cells

Jinhyun Kim and Sanggyu Yim

Appl. Phys. Lett. 99, 193303 (2011); http://dx.doi.org/10.1063/1.3660710 (3 pages) | Cited 2 times

Online Publication Date: 8 November 2011

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In this study, small-molecule organic solar cells based on choloro[subphthalocyaninato]boron (III) (SubPc) as an electron donor and fullerene (C60) as an electron acceptor were fabricated by varying the thickness, d, of the SubPc layer. The power conversion efficiency was maximized to 1.8% at d ∼ 130 Å due to the relatively large values of the short-circuit current density (JSC) and fill factor (FF). This optimal thickness was also strongly related to the surface morphology evolution of the SubPc thin films. The corrugated surface nanostructures were continually formed until the thickness of the film increased up to 130 Å, which is advantageous for the formation of an interdigitated electron donor-acceptor interface. In contrast, for films thicker than 130 Å, the corrugated surface structures were filled with subsequently deposited molecules, leading to a smoother morphology and consequently reduced JSC and FF value of the cells.
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88.40.hj Efficiency and performance of solar cells
88.40.jr Organic photovoltaics
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Spectral resolution of states relevant to photoinduced charge transfer in modified pentacene/ZnO field-effect transistors

Josef W. Spalenka, Ehren M. Mannebach, Dominick J. Bindl, Michael S. Arnold, and Paul G. Evans

Appl. Phys. Lett. 99, 193304 (2011); http://dx.doi.org/10.1063/1.3660225 (3 pages) | Cited 1 time

Online Publication Date: 9 November 2011

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Pentacene field-effect transistors incorporating ZnO quantum dots can be used as a sensitive probe of the optical properties of a buried donor-acceptor interface. Photoinduced charge transfer between pentacene and ZnO in these devices varies with incident photon energy and reveals which energies will contribute most to charge transfer in other structures. A subsequent slow return to the dark state following the end of illumination arises from near-interface traps. Charge transfer has a sharp onset at 1.7 eV and peaks at 1.82 and 2.1 eV due to transitions associated with excitons, features absent in pentacene FETs without ZnO.
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85.30.Tv Field effect devices
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Compact model for photo-generation current in organic solar cell

Ling Li, Jang Hyuk Kwon, and Jin Jang

Appl. Phys. Lett. 99, 193305 (2011); http://dx.doi.org/10.1063/1.3658729 (3 pages) | Cited 1 time

Online Publication Date: 10 November 2011

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A compact model is presented for the photo-generation current in organic solar cell. It is developed rigorously by extending the photo-generation current in Goodman [A. M. Goodman and A. Rose, J. Appl. Phys. 7, 2823 (1971)] to include charge variable range hopping transport and recombination in organic semiconductors. Based on the extended model, a variety of temperature/material disorders and light intensity dependence of the photo-generation current can be well described. Good agreement between the calculation and recent experimental data is also observed.
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88.40.jr Organic photovoltaics
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A simple merocyanine tandem solar cell with extraordinarily high open-circuit voltage

V. Steinmann, N. M. Kronenberg, M. R. Lenze, S. M. Graf, D. Hertel, H. Bürckstümmer, F. Würthner, and K. Meerholz

Appl. Phys. Lett. 99, 193306 (2011); http://dx.doi.org/10.1063/1.3657145 (3 pages) | Cited 4 times

Online Publication Date: 10 November 2011

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We present a highly efficient tandem solar cell based on a merocyanine dye, containing two identical subcells connected in series. A recombination layer of Al/MoO3 was used. Due to a substantial improvement of the fill factor, the overall efficiency of the tandem cell was even higher than that of the single-cell reference with identical active layer thickness. By combining the planar heterojunction and the bulk heterojunction concept, efficiencies up to 4.8% were achieved while maintaining a rather simple, fully vacuum-processed device stack consisting of only four organic layers. The optimized open-circuit voltage was as large as 2.1 V.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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Near-infrared absorbing semitransparent organic solar cells

Jan Meiss, Felix Holzmueller, Roland Gresser, Karl Leo, and Moritz Riede

Appl. Phys. Lett. 99, 193307 (2011); http://dx.doi.org/10.1063/1.3660708 (3 pages) | Cited 4 times

Online Publication Date: 11 November 2011

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We present efficient, semitransparent small molecule organic solar cells. The devices employ an indium tin oxide-free top contact, consisting of thin metal films and an additional organic capping layer for enhanced light in/outcoupling. The solar cell encorporates a bulk heterojunction with the donor material Ph2-benz-bodipy, an infrared absorber. Combination of Ph2-benz-bodipy with C60 as acceptor leads to devices with high open circuit voltages of up to 0.81 V and short circuit current densities of 5-6 mA/cm2, resulting in efficiences of 2.2%-2.5%. At the same time, the devices are highly transparent, with an average transmittance in the visible range (400-750 nm) of up to 47.9%, with peaks at 538 nm of up to 64.2% and an average transmittance in the yellow-green range of up to 61.8%.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
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