Paul Fuierer | New Mexico Tech (original) (raw)

Papers by Paul Fuierer

Proceedings volume ... annual spring meeting, Apr 19, 2024

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Apr 1, 2017

Solar Energy, Sep 1, 2019

This research article is presenting photovoltaic performance of a sensitized solar cell with CuZn... more This research article is presenting photovoltaic performance of a sensitized solar cell with CuZnInS 3 as the sensitizer. The as-prepared nanocrystals were tested for the Cu:Zn composition dependent performance of photovoltaic solar cells. Out of all the tested nanocrystals with various compositions, a power conversion efficiency as high as 1.1% was observed with Cu:Zn 1:2 composition. A simple, low temperature method was employed to synthesize highly luminescent CuZnInS 3 quaternary nanocrystals using chloride salts of metal precursors. The synthesis was done by heating metal precursors followed by injection of elemental sulfur. The size and the elemental composition of the nanocrystals were investigated using transmission electron microscopy (TEM) and X-ray energy dispersive spectroscopy (EDS) The nanocrystals showed a uniform size distribution with average particle size of 5 nm with the exception of Cu:Zn 1:1 sample. The findings showed that the optical properties of these nanocrystals can be tuned by varying Cu:Zn metal precursor ratio. The as-synthesized nanocrystals showed photoluminescence quantum yield as high as 68%.

MRS Proceedings, 1992

ABSTRACTSolid solution compositions of Sr2(NbxTa1−x)2O7 ceramics with Tr ranging from 450°C to 13... more ABSTRACTSolid solution compositions of Sr2(NbxTa1−x)2O7 ceramics with Tr ranging from 450°C to 1342°C were fabricated utilizing a hot-forging technique to achieve preffered grain orientation and thus enhance poling. Translucent samples with greater than 99% theoretical density were obtained using this process. Depending on composition, the degree of orientation as determined by x-ray diffraction was found to be 75% to 95%. The thermal expansion, resistivity, and dielectric constant were shown to be very anisotropic. The direction perpendicular to the forging axis proved to be the ferroelectric “easy” direction, exhibiting hysteresis behavior. Piezoactivity in PLS polycrystals was measured for the first time. Hot-forged samples were electrically poled and the electromechanical properties determined using the five different modes of vibration. For Sr2(Nb0.5Ta0.5)2O7: N24=1504 Hz-m, s44=18.2×10-12m2/N, k24=3.0%, d24=2.6 pC/N, g24=6.3×10-3 Vm/N, and Qm=1100. This material was also shown to resist depoling when exposed to temperatures as high as 650°C.

Materials Letters, Aug 1, 2011

ABSTRACT Dye sensitized solar cells were made on TiO2 scaffold anodes of rutile particles. These ... more ABSTRACT Dye sensitized solar cells were made on TiO2 scaffold anodes of rutile particles. These TiO2 scaffold anodes were grown from rutile seeds by using a molten salt synthesis technique. Different thickness coatings of mixed amorphous titanium hydroxide and NaCl–KCl eutectic salt mixture on the rutile seeds were heat treated at different temperatures. The rutile whiskers of different aspect ratios were grown depending on the growth temperature. The best photovoltaic performances were obtained for the device made from the scaffold of 20–50nm diameter and 0.5–1μm length nanowhiskers obtained at 700°C for 5h of treatment.

Journal of Materials Research, Feb 1, 2006

A new type of nanocrystalline samarium-doped-ceria/yttrium-stabilized-zirconia (SDC/YSZ) heteroph... more A new type of nanocrystalline samarium-doped-ceria/yttrium-stabilized-zirconia (SDC/YSZ) heterophase thin film electrolytes was synthesized on MgO and Si substrates by spin coating and thermal treatment of SDC-nanoparticle-incorporated polymeric precursors. In the heterophase films, SDC nanoparticles were uniformly dispersed in a nanocrystalline YSZ matrix. The heterophase structure was stable when fired in air at temperatures up to 850 °C. The nanocrystalline heterophase thin films exhibited electrical conductivities significantly higher than that of the phase-pure YSZ and SDC nanocrystalline thin films at reduced temperatures. The effects of SDC grain size and volume fraction on the electrical conductivity of the heterophase films were also studied.

International Journal of Student Project Reporting

Colorants

The goal of this work was to optimize the combination of natural dyes producing panchromatic abso... more The goal of this work was to optimize the combination of natural dyes producing panchromatic absorption matched to the AM1.5 solar spectrum for use in dye sensitized solar cells (DSSCs). Six classes of dyes (Anthocyanins, Betalins, Chlorophyll, Xanthonoids, Curcuminoids and Phycobilins) were explored. UV-Vis data and radial basis function interpolation were used to model the absorbance of 2568 combinations, and three objective functions determined the most commensurable spectrum. TiO2 anodes were sensitized with 42 dye combinations and IV measurements made on simple cells. The absorbance-optimized combination yielded an efficiency of only 0.41%, compared to 1.31% for a simple 1:1 molar ratio of Curcuminoids and α-Mangostin, which showed symbiotic effects. Our results indicate that panchromatic absorption alone is not sufficient to predict optimal DSSC performance, although the mathematical approach may have broader application.

International Journal of Applied Ceramic Technology

Bismuth titanate Bi{sub 4}Ti{sub 3}O{sub 12} (BIT) is a ferroelectric with a layered structure wh... more Bismuth titanate Bi{sub 4}Ti{sub 3}O{sub 12} (BIT) is a ferroelectric with a layered structure which exhibits the polarization-electric field (P-E) switching behavior necessary for memory applications in bulk ceramic form, but has not been studied in thin film form to the extent that Pb(Zr,Ti)O{sub 3} has. BIT offers the favorable characteristics of higher Curie temperature (and thus higher temperature resistance and/or operation) and lower strains associated with the switching of polarization. Highly c-axis oriented BIT films have been successfully prepared by a polymeric sol-gel spin-on technique. Properties include a dielectric constant of 154, remanent polarization of 5 {mu}C/cm{sup 2}, and coercive field of 90 KV/cm. The key to highly textured films is proper aging of the precursor solution.

Journal of Materials Science, 2011

... R. Maier Materials Research Laboratory, The Pennsylvania State University, University Park, P... more ... R. Maier Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA U. Röder-Roith Á R. Moos Functional Materials Laboratory, University of Bayreuth, 95447 Bayreuth, Germany ... zirconia ram surfaces inside a vertical clamshell furnace. ...

Journal of Crystal Growth, 1999

... at New Mexico Tech, and was used to deposit ferroelectric lead titanate (PT) and lead zircona... more ... at New Mexico Tech, and was used to deposit ferroelectric lead titanate (PT) and lead zirconatetitanate (PZT) thin ... the Bi 4 Ti 3 O 12 phase were controlled by varying the ratio of bismuth to titanium ... ratio (W Bi /W Ti <1) in the powder mixture leads to the growth of pyrochlore (Bi 2 ...

Applied Physics Letters, 2008

The thermal conductivity of c-axis textured polycrystalline perovskite Bi4Ti3O12 and random polyc... more The thermal conductivity of c-axis textured polycrystalline perovskite Bi4Ti3O12 and random polycrystalline material is reported up to 1000 °C. Based on measurements of the thermal diffusivity, density, and specific heat, the thermal conductivity is lower along the c-axis than in the a-b plane by almost a factor of 2, and the anisotropy persists up to at least 1000 °C despite