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You searched on: Author: edwin heilweil Sorted by: date

Displaying records 1 to 10 of 103 records.
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1. Charge Carrier Dynamics and Mobility Determined by Time-Resolved Terahertz Spectroscopy on Films of Nano-to-Micrometer-Sized Colloidal Tin(II) Monosulfide
Published: 8/1/2016
Authors: Brian Gregory Alberding, Adam J Biacchi, Angela R Hight Walker, Edwin J Heilweil
Abstract: Tin(II) monosulfide (SnS) is a semiconductor material with an intermediate band gap, high absorption coefficient is the visible range, and consists of earth abundant, non-toxic elements. For these reasons, SnS has generated much interest for incorpo ...

2. Transient Optical and Terahertz Spectroscopy of Nanoscale RuO2
Published: 8/1/2016
Authors: Edwin J Heilweil, Brian Gregory Alberding, Paul D. Cunningham, Joseph S Melinger, Jeffrey C. Owrutsky, Adam D. Dunkelberger
Abstract: Solution-deposited nanoscale films of RuO2, ,nanoskins,Š are effective transparent conductors because after calcining to 523 K they exhibit flat optical extinction across the visible and infrared combined with relatively high electrical conductivity. ...

3. Reduced Photoconductivity Observed by Time-Resolved Terahertz Spectroscopy in Metal Nanofilms with and without Adhesion Layers
Published: 5/29/2016
Authors: Brian Gregory Alberding, Edwin J Heilweil, Gary P. Kushto, Paul A. Lane
Abstract: Time-resolved terahertz spectroscopy (TRTS) has been used to study the transient photoconductivity of nanometer-scale metallic films deposited on fused quartz substrates. Samples of 8 nm thick gold or titanium show an instrument-limited decrease ...

4. Probing Charge Transfer and Hot Carrier Dynamics in Organic Solar Cells with Terahertz Spectroscopy
Published: 5/10/2016
Authors: Paul D. Cunningham, Paul A. Lane, Joseph S Melinger, Okan Esenturk, Edwin J Heilweil
Abstract: Time-resolved terahertz spectroscopy (TRTS) was used to explore charge generation, transfer, and the role of hot carriers in organic solar cell photovoltaic materials. Two model molecular photovoltaic systems were investigated: with Zinc Phthaloc ...

5. Time-resolved terahertz spectroscopy (TRTS) of electrically conductive metal-organic frameworks (MOFs) doped with redox active species
Published: 9/24/2015
Authors: Brian Gregory Alberding, Edwin J Heilweil
Abstract: Metal-Organic Frameworks (MOFs) are three-dimensional coordination polymers that are well known for large pore surface area and their ability to adsorb molecules from both the gaseous and solution phases. In general, MOFs are electrically insulating, ...

6. Direct Observation of Carrier Cooling in Organic Semiconductors
Published: 7/16/2015
Authors: Edwin J Heilweil, Paul A. Lane, Paul D. Cunningham, Joseph S Melinger
Abstract: Photocurrent in an organic solar cell is generated by a charge transfer reaction between the electron donor and acceptor. The effect of excess excitation energy and the relative contributions of electron and hole transfer are the subject of intense s ...

7. Linkage Isomerization via Geminate Cage or Biomolecular Mechanisms: Time-Resolved Investigations of an Organometallic Photochrome
Published: 3/25/2015
Authors: Edwin J Heilweil, Kristy M Dewitt, Tung T To, Theodore Joseph Burkey
Abstract: A metal center reversibly migrates from a pyridinyl group to a nitrile group in the light driven linkage isomerization of dicarbonyl(3-cyanomethylpyridine-N3)(eta-5-methylcyclopentadienyl)-manganese (4) to dicarbonyl(3-cyanomethylpyridine-CN)(eta-5-m ...

8. Linkage Isomerization via Germinate Cage or Biomolecular Mechanisms: Time-Resolved Investigations of an Oranometalic Photochrome
Published: 3/25/2015
Author: Edwin J Heilweil
Abstract: The extent of the photoinitiated linkage isomerization of dicarbonyl(3-cyanomethylpyridine-kappa-N3)(eta-5-methylcyclopentadienyl)manganese (4) to dicarbonyl(3-cyanomethylpyridine-kappa-CN)(eta-5-methylcyclopentadienyl)-manganese (5) was examined by ...

9. Hot photocarrier dynamics in organic semiconductors studied by ultrafast terahertz photoconductivity and transient absorption spectroscopies
Published: 11/3/2014
Authors: Paul A Lane, Paul D. Cunningham, Joseph S Melinger, Edwin J Heilweil
Abstract: We present a study of charge transfer and carrier dynamics in nano-films of zinc phthalocyanine (ZnPc) and buckmisnster¬fullerene (C60) by investigated by time-resolved terahertz spectroscopy (TRTS). We compare terahertz photocon¬ductivity dynamics i ...

10. Ultrafast THz photoconductivity of photovoltaic polymer-fullerene blends: a comparative study correlated with photovoltaic device performance
Published: 10/10/2014
Authors: Edwin J Heilweil, Jin Zuanming, Dominik Gehrig, Clare Dyer-Smith, Frederic Laquai, Mischa Bonn, Dmitry Turchinovich
Abstract: Ultrafast photo-induced carrier dynamics in prototypical low band-gap polymer:fullerene photovoltaic blend films PTB7:PC70BM and P3HT:PC70BM is investigated using ultrafast terahertz (THz) spectroscopy. The sub-picosecond (ps) and few-ps decays of TH ...

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