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15 May 2000

Volume 76, Issue 20, pp. 2815-2963

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Direct-current characteristics of pnp AlGaN/GaN heterojunction bipolar transistors

A. P. Zhang, G. T. Dang, F. Ren, J. Han, A. G. Baca, R. J. Shul, H. Cho, C. Monier, X. A. Cao, C. R. Abernathy, and S. J. Pearton

Appl. Phys. Lett. 76, 2943 (2000); http://dx.doi.org/10.1063/1.126524 (3 pages) | Cited 11 times

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AlGaN/GaN pnp heterojunction bipolar transistors were fabricated using a low-damage dry-etch process, and the dc characteristics measured up to 250 °C. In the common–base mode, the collector current was approximately equal to the emitter current under all conditions. Although not optimized for power operations, the devices were tested up to power densities of ∼50 kW cm−2. The dc current gain was in the range 20–25 at room temperature. The pnp configuration avoids the problem of high base sheet resistance encountered with npn-AlGaN/GaN devices. © 2000 American Institute of Physics.
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85.30.Pq Bipolar transistors

Highly polarized blue electroluminescence from homogeneously aligned films of poly(9,9-dioctylfluorene)

K. S. Whitehead, M. Grell, D. D. C. Bradley, M. Jandke, and P. Strohriegl

Appl. Phys. Lett. 76, 2946 (2000); http://dx.doi.org/10.1063/1.126525 (3 pages) | Cited 88 times

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Homogeneous alignment of poly(9,9-dioctylfluorene) films on thin layers of rubbed precursor-route poly(p-phenylenevinylene) allows the construction of light-emitting diodes that emit highly polarized blue light (λem = 458 nm). The rubbed poly(p-phenylenevinylene) acts as an effective hole-injecting alignment layer. Annealing of poly(9,9-dioctylfluorene) in its nematic phase followed by rapid quenching orients the polymer as a glassy monodomain on the alignment layer and gives devices with a polarization ratio of 25:1 and a luminance of up to 250 cd/m2. © 2000 American Institute of Physics.
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78.60.Fi Electroluminescence
85.60.Jb Light-emitting devices
78.66.Qn Polymers; organic compounds
61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures
81.30.Fb Solidification
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