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Search Publications by: Paul M Haney (Fed)

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Displaying 126 - 148 of 148

Effects of phase-breaking scattering on the thermopower of molecular systems.

October 26, 2012
Author(s)
Adrian Popescu, Paul M. Haney
We study the effects of elastic and inelastic scattering on the thermoelectric transport properties of molecular systems. These systems can exhibit high thermopower due to resonant transmission through molecular orbitals. We focus on systems which exhibit

High-Resolution Local Current Measurement of CdTe Solar Cells

October 4, 2012
Author(s)
Heayoung Yoon, Dmitry A. Ruzmetov, Paul M. Haney, Marina S. Leite, Behrang H. Hamadani, Albert A. Talin, Nikolai B. Zhitenev
We investigate local electronic properties of CdTe solar cells using electron beam to excite electron-hole pairs and evaluate spatially resolved photocurrent characteristics. Standard semiconductor processes were used to fabricate Ohmic metal contacts on

Effect of Tin Doping on alpha-Fe2O3 Photoanodes for Water Splitting

June 28, 2012
Author(s)
Christopher C. Bohn, Amit Agrawal, Erich C. Walter, Mark D. Vaudin, Andrew Herzing, Paul M. Haney, Albert A. Talin, Veronika Szalai
Sputtered-deposited films of α-Fe2O3 of thickness 600 nm were investigated as photoanodes for solar water splitting and found to have photocurrents as high as 0.8 mA/cm2 at 1.23 V vs. the reversible hydrogen electrode (RHE). The incorporation of Sn into

Electrolyte stability determines scaling limits for solid-state 3D Li-ion batteries

December 20, 2011
Author(s)
Dmitry A. Ruzmetov, Vladimir P. Oleshko, Paul M. Haney, Henri J. Lezec, K Karki, K Baloch, Amit K. Agrawal, Albert Davydov, Sergiy Krylyuk, Y Liu, JY Huang, Mihaela M. Tanase, John Cumings, Albert A. Talin
Rechargeable, all-solid state Li-ion batteries (LIBs) with high specific capacity and small footprint are highly desirable to power an emerging class of miniature, autonomous microsystems that operate without a hardwire for power or communications. A

Imaging of nanoscale charge transport in bulk heterojunction solar cells

June 17, 2011
Author(s)
Behrang H. Hamadani, Nadine E. Gergel-Hackett, Paul M. Haney, Nikolai B. Zhitenev
We have studied the local charge transport properties of organic bulk heterojunction solar cells based on the blends of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) with a photoconductive atomic force microscope (PCAFM). We

Efficiency Enhancement of Copper Contaminated Radial p-n Junction Solar Cells

January 7, 2011
Author(s)
Akram Boukai, Paul M. Haney, Aaron Katzenmeyer, Gregg M. Gallatin, Albert A. Talin, Peidong Yang
A significant fraction of the cost of a planar p-n junction silicon solar cell stems from the silicon purification process.1 Eliminating the purification step would decrease the cost, yet also decrease the solar cell efficiency significantly. Here, we have

Current induced torques in the presence of spin-orbit coupling

September 17, 2010
Author(s)
Paul M. Haney, Mark D. Stiles
In systems with strong spin-orbit coupling, the relationship between spin-transfer torque and the divergence of the spin current is generalized to a relation between spin transfer torques, total angular momentum current, and mechanical torques. In

Origin of Nanoscale Variations in Photoresponse of an Organic Solar Cell

April 22, 2010
Author(s)
Behrang H. Hamadani, Suyong S. Jung, Paul M. Haney, Lee J. Richter, Nikolai B. Zhitenev
Photo generated charge transport in bulk heterojunction (BHJ) solar cells is strongly dependent on the active layer nanomorphology resulting from phase segregation and connectivity of the donor and acceptor regions. Scanning probe-based techniques and in

Magnetic dynamics with spin transfer torques near the Curie temperature.

September 24, 2009
Author(s)
Paul M. Haney, Mark D. Stiles
In this paper we explore the combined action of large thermal fluctuations and spin transfer torques on the behavior of magnetic layers in spin valves. We find that at temperatures near Tc, spin currents can measurably change the size of the magnetization