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17 Jan 2011

Volume 98, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 98, 031101 (2011); http://dx.doi.org/10.1063/1.3529469 (3 pages)

Sinan Balci, Askin Kocabas, Coskun Kocabas, and Atilla Aydinli
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Improving optical performance of low bandgap polymer solar cells by the two-mode moderate microcavity

Yongbing Long (龙拥兵)

Appl. Phys. Lett. 98, 033301 (2011); http://dx.doi.org/10.1063/1.3541960 (3 pages)

Online Publication Date: 18 January 2011

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A two-mode moderate microcavity (MM) structure has been constructed to confine large optical electric field in the low band gap polymer solar cells by inserting a titanium dioxide (TiO2) layer into the devices. Simulations demonstrate the two-mode MM can significantly improve the light absorption at two discrete wavelength ranges and yield an improvement of about 13.8% in total absorbed photons (TAPs) for the device with a 60 nm thick active layer. Combined with an optical spacer, the MM structure leads to a larger improvement of 32.8% in TAPs. The efficacy of the MM structure is revealed to be strongly dependent on the active layer thickness.
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88.40.jr Organic photovoltaics
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Efficient organic light-emitting devices with platinum-complex emissive layer

Xiaohui Yang, Fang-Iy Wu, Hanna Haverinen, Jian Li, Chien-Hong Cheng, and Ghassan E. Jabbour

Appl. Phys. Lett. 98, 033302 (2011); http://dx.doi.org/10.1063/1.3541447 (3 pages) | Cited 2 times

Online Publication Date: 18 January 2011

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We report efficient organic light-emitting devices having a platinum-complex emissive layer with the peak external quantum efficiency of 17.5% and power efficiency of 45 lm W−1. Variation in the device performance with platinum-complex layer thickness can be attributed to the interplay between carrier recombination and intermolecular interactions in the layer. Efficient white devices using double platinum-complex layers show the external quantum efficiency of 10%, the Commission Internationale d’Énclairage coordinates of (0.42, 0.41), and color rendering index of 84 at 1000 cd m−2.
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85.60.Jb Light-emitting devices
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
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Stability of polarization in organic ferroelectric metal-insulator-semiconductor structures

R. Kalbitz, P. Frübing, R. Gerhard, and D. M. Taylor

Appl. Phys. Lett. 98, 033303 (2011); http://dx.doi.org/10.1063/1.3543632 (3 pages) | Cited 3 times

Online Publication Date: 19 January 2011

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Dielectric measurements have been carried out on all-organic metal-insulator-semiconductor structures with the ferroelectric polymer poly(vinylidenefluoride-trifluoroethylene) as the gate insulator. It is shown that the polarization states remain stable after poling with accumulation and depletion voltage. However, negative charge trapped at the semiconductor-insulator interface during the depletion cycle masks the negative shift in flatband voltage expected during the sweep to accumulation voltages.
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices
84.32.Tt Capacitors
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Mobility determination using frequency dependence of imaginary part of impedance (Im Z) for organic and polymeric thin films

Durgesh C. Tripathi, Awnish K. Tripathi, and Y. N. Mohapatra

Appl. Phys. Lett. 98, 033304 (2011); http://dx.doi.org/10.1063/1.3544935 (3 pages)

Online Publication Date: 21 January 2011

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In view of a growing need for purely electrical techniques of determining carrier mobility under actual device conditions in organic semiconductors, we demonstrate that instead of difference susceptance, the frequency dependence of imaginary part of impedance is a simpler, more convenient, and powerful method of determination of mobility. We illustrate it by using the method to determine field dependence of mobility, and hence Poole–Frenkel coefficient, for the case of small molecule m-MTDATA and polymeric MEH-PPV. We also determine the correct numerical factors required to obtain true transit times and compare that with electroluminescence transient. We also show that these measurements are robust in presence of dispersive transport avoiding interpretative difficulties in determination of mobility.
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73.61.Ph Polymers; organic compounds
81.05.Fb Organic semiconductors
72.20.Ht High-field and nonlinear effects
78.60.Fi Electroluminescence
78.66.Qn Polymers; organic compounds
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