“ dark –axis ”

1. Undergraduate Research on Complex MaterialsDennis P. Clougherty, University of Vermont & State Agricultural College, DMR 1062966 Figure 1. (a,c) Organic photovoltaic cells were constructed from evaporated layers of donor and acceptor molecules. Each cell is designed so that incident light reflects from the back Aluminum contact and forms a standing wave with the peak electric field in the active region of the cell. (b,d) A discotic liquid crystal organic semiconductor (HAT-4) was aligned between two conducting slides with the molecules stacked for form an electrical connection between the two surfaces. Electrical current was measured as the slides were pressed together to push the molecules closer together in an attempt to change the conductivity by the application of pressure. Figure 3. (a) Polarized optical microscope image of a polycrystalline mixture of metal and metal free phthalocyanine organic semiconductors. The contrast indicated the different orientation of individual grains with respect to the polarizer axis. b) Films exhibit a large amount of linear dichroism (LD) as a result of long range order (c) LD laser microscopy image of a single grain boundary. The LD contrast is a measure of the relative angle between adjacent grains. (d) Polarization-resolved microscopy spectra recorded at various locations inside the LD image reveal the emission is highly polarized in the plane of the molecules(blue dot). The polarization of luminescence is lost at grain boundaries (black dot) because of disorder Fig 3. (b) (a) P =18% 10:1 H2OBPc :CoOBPc (d) (c)  = 730nm “dark –axis”  Cody Lamarche and Lauren Paladino T. J. Howard and Doug Beck P = 80% Figure 4. Due to its small size, mass and bosonic symmetry, when atoms of helium-4 are cooled to low temperatures, they resist solidification at ambient pressure and instead conspire to form a collective quantum state of matter which supports mass transport without viscosity. The finite size scaling properties of this superfluid state of matter were investigated through large scale Monte Carlo simulations in the grand canonical ensemble. Figure 2. General structure of phthalocyanine derivatives targeted for synthesis to better understand structural and electronic properties of molecular precursors to solution-deposited polycrystalline films. At the same time, synthesis of new polymers containing arsenic atoms in the main chain was attempted (not depicted). Joseph Cupo Andrea Rommel

2. Undergraduate Research on Complex MaterialsDennis P. Clougherty, University of Vermont & State Agricultural College, DMR 1062966 The UVM REU program includes weekly cohort meetings with faculty to discuss the nature of science and research, written and oral presentation skills, NSF funding process and proposal writing, and legal and ethical issues in research.