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8 Aug 2011

Volume 99, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 99, 063701 (2011); http://dx.doi.org/10.1063/1.3622631 (3 pages)

Bomi Gweon, Mina Kim, Dan Bee Kim, Daeyeon Kim, Hyeonyu Kim, Heesoo Jung, Jennifer H. Shin, and Wonho Choe
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Light trapping by a dielectric nanoparticle back reflector in film silicon solar cells

Benjamin G. Lee, Paul Stradins, David L. Young, Kirstin Alberi, Ta-Ko Chuang, J. Gregory Couillard, and Howard M. Branz

Appl. Phys. Lett. 99, 064101 (2011); http://dx.doi.org/10.1063/1.3615796 (3 pages) | Cited 10 times

Online Publication Date: 9 August 2011

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Drop-coated high-refractive-index nanoparticles used as a back reflector for thin-film solar cells are non-absorbing Mie-scatterers that enhance light trapping. We present optical measurements and theory for this approach. A 40% enhancement of the photocurrent and efficiency of a 2.5 μm thick single-crystal Si solar cell on display glass is achieved by adding a back reflector of 270 nm rutile TiO2 nanoparticles.
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88.40.jj Silicon solar cells

Irreversibility and pinching in deterministic particle separation

Mingxiang Luo, Francis Sweeney, Sumedh R. Risbud, German Drazer, and Joelle Frechette

Appl. Phys. Lett. 99, 064102 (2011); http://dx.doi.org/10.1063/1.3617425 (3 pages) | Cited 5 times

Online Publication Date: 12 August 2011

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We investigate the settling of spherical particles through a pinching gap created by a cylindrical obstacle and a vertical wall. These macroscopic experiments capture the essence of pinched-flow-fractionation in microfluidics and highlight its deterministic nature. In the absence of pinching, we observe asymmetric trajectories consistent with a hard-core model of particle-obstacle repulsion that leads to separative lateral displacement. Then, we show that pinching promotes the onset of these short-range repulsion forces, amplifying the relative separation in the outgoing trajectory of different-size particles. Inertia effects, however, tend to reduce such relative separation and lead to a more complex behavior.
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47.85.Np Fluidics
47.61.-k Micro- and nano- scale flow phenomena
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