Aina Quintilla

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Selenium nanoparticles with diameters of 100-400nm are prepared via hydrazine-driven reduction of selenious acid. The as-prepared amorphous, red selenium (a-Se) particles were neither a stable phase nor were they colloidally stable. Due to phase transition to crystalline (trigonal), grey selenium (t-Se) at or even below room temperature, the particles(More)
We discuss the influence of selenization time during the preparation of low-cost CuInSe<inf>2</inf> (CIS) solar cells using commercially available elemental Cu and In nanoparticles. A simple non-vacuum ink deposition method is used where the nanoparticles are dispersed in alcohol and deposited onto a Mo-coated substrate in ambient atmosphere. Furthermore we(More)
An additional carbon layer between Cu(In,Ga)Se<inf>2</inf> (CIGS) layer and molybdenum (Mo) back contact can increase the efficiency of solar cells with very thin absorber layers. In this study the so produced solar cells co-evaporated on top of a carbon layer are compared with cells co-evaporated directly on molybdenum. We found that the carbon layer leads(More)
With the atomistic Kubo-Verges method we calculate the ballistic conductance of various conformers of DNA (A,B,Z), as well as intermediate and composite conformations, using experimental structures and model complexes. For duplexes with 6 and 15 base pairs, we find that the valence band conductivity near the Fermi edge varies dramatically between the(More)
Solution processable nanocrystal solar cells combine the advantages of low-cost printing and wide range of accessible absorber materials, however high trap densities limit performance and layer thickness. In this work we develop a versatile route to realize the infiltration of a photonic crystal, with copper indium diselenide nanocrystal ink. The photonic(More)
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