University of Massachusetts Amherst

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Fulleropyrrolidine Interlayers for High Efficiency Perovskite Solar Cells
Interface engineering is critical for achieving efficient solar cells.  This invention provides a significant power conversion efficiency (PCE) improvement of fullerene/perovskite planar heterojunction solar cells from 7.50% to 15.48% by inserting a fulleropyrrolidine interlayer between the metal electrode and the electron transport layer. The interlayer enhances recombination resistance, increases electron extraction rate and prolongs free carrier lifetime.cells.
Published: 8/11/2017   |   Inventor(s): Thomas Russell, Todd Emrick, Yao Liu, Zachariah Page
Category(s): Devices, Physical Science, Material science, Clean Energy
Patterning of 1-D, 2-D and 3-D Nanostructures
This invention provides methods of manufacturing a nanotextured surface comprising disposing a nanoparticulate ink on a substrate.
Published: 8/9/2017   |   Inventor(s): James Watkins, Rohit Kothari
Category(s): Material science, Nanotechnology, Physical Science, Devices & sensors
Flame Retardant Monomers and Polymers
This invention provides new flame retardant monomers and polymers made using such and other monomers. The new flame retardant monomers can reduce polymer flammability due to char formation. Upon the incorporation of such monomers into the polymer structure, their additional functional groups or handles impart reactivity to the polymer, enabling the formation of new functional polymeric and composite materials.
Published: 9/14/2016   |   Inventor(s): Todd Emrick, Aabid Mir, Umesh Choudhary
Category(s): Chemicals, Material science, Physical Science
Ultra-high Strength Multilayer Graphene Materials
This invention relates to the use of single crystalline graphene to create multilayer structures of graphene materials with superior shear strength.
Published: 9/14/2016   |   Inventor(s): Christos Dimitrakopoulos, Dimitrios Maroudas, Andre Muniz, D. Kurt Gaskill
Category(s): Material science, Nanotechnology, Electronics, Engineering, Physical Science
Method for Preparing Aerogels and Foams
The technology described here is a method for making aerogels, the lightest and lowest density known solid on the planet.  Most aerogels are prepared using supercritical drying or freeze drying.  These techniques use supercritical fluids that are supercritical at high pressures and temperatures and can sometimes be hazardous.  Other supercritical fluid based methods use low pressure solvent removal and/or freezing and both of these methods are energy intensive and result in high production costs.

To prepare aerogels and foam materials using this process, the polymer material is frozen while the remaining steps take place at ambient pressure and room temperature. The resulting bioactive polymer has a bulk density of 500 -2500 grams per cubic meter. Compared to other methods, this is a cost-effective and safe method of preparing foams and aerogels. Moreover, the method consumes less energy and is also environmentally-friendly, as the aqueous solutions and solvents used in the process can be easily recovered and recycled.

Published: 9/13/2016   |   Inventor(s): Kenneth Raymond Carter, Yinyong Li
Category(s): Nanotechnology, Material science, Engineering, Physical Science
Efficient Thermoelectric Converters
The invention provides thermoelectric devices similar to conventional Peltier-elements based on folded, multi-layered nanomembranes prepared from 2-dimensional (2D) van der Waals materials. These van der Waals materials (e.g. graphene, hexagonal boron nitride, and transition metal dichalcogenides) have both single atomic layers with strong in-plane covalent bonding and weak bonding across atomic mononolayers. When devices are fabricated by folding monolayers onto themselves and into layered structures (figure). In this configuration, the electric path is shorter and the thermal path is suppressed. Moreover, multiple elements can be combined in series and parallel configurations to produce a useful amount of electricity. Thus, these devices can be used to convert waste-heat into electricity and can also serve a thermoelectric cooler. Some information about different applications here.
Published: 3/8/2016   |   Inventor(s): Zlatan Aksamija, Robert Blick
Category(s): Clean Energy, Devices, Devices & sensors, Electronics, Engineering, Material science, Nanotechnology, Physical Science
Deoxybenzoin-based Anti-flammable Polyphosphonate and Poly(arylate-phosphonate) Copolymer Compounds
Synthetic polymers are used extensively as plastics, rubbers, foams, textiles, and construction materials; however, the flammability of many polymers is recognized as a safety hazard and an important challenge in polymer research. To reduce polymer flammability, halogenated small molecule flame-retardant additives are commonly incorporated into polymer materials. However, such halogenated additives may compromise polymer properties, and moreover pose environmental problems associated with additive leaching. To overcome these problems, researchers at UMass Amherst have developed halogen-free, inherently flame-retardant polymers. This invention provides deoxybenzoin-based anti-flammable polyphosphonate and poly(acylate-phophonate copolymer compounds with low heat release capacity values and high char yields.
Published: 6/19/2015   |   Inventor(s): Todd Emrick, T. Ranganathan, E. Bryan Coughlin, Richard Farris, Joseph Zilberman
Category(s): Chemicals, Environmental, Material science, Physical Science
Anti-flammable Compounds and Adhesive Materials
This invention provides new chemical compositions and methods for the preparation of adhesive materials that have low flammability. The low flammability is due to newly invented organic/polymeric components used in the adhesive formulation, rather than through the addition of a conventional anti-flammable additives such as halogenated organic molecules or phosphorous-containing structures.
Published: 6/17/2015   |   Inventor(s): Todd Emrick, Justin Timmons, Megan Szyndler
Category(s): Chemicals, Environmental, Material science, Physical Science
Stablizing Liquid Drops ofof Arbitrary Shapes by the Interfacial Jamming of Nanoparticles
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Published: 6/16/2015   |   Inventor(s): Thomas Russell, Todd Emrick, Mengmeng Cui
Category(s): Material science, Nanotechnology, Engineering, Physical Science
Processable Polymers and Polymer Foams Made Without Organic Solvents
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Published: 6/8/2015   |   Inventor(s): Alan Lesser, Gregory Connor Evans
Category(s): Material science, Physical Science
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