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Author: lee richter

Displaying records 31 to 40 of 89 records.
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31. Critical Role of Side-Chain Attachment Density on the Order and Device Performance of Polythiophenes
Published: 10/30/2007
Authors: Regis J Kline, Dean M DeLongchamp, Daniel A Fischer, Eric K Lin, Lee J Richter, Michael L. Chabinyc, Martin Heeney, Iain McCulloch
Abstract: High performance, solution processable semiconductors are critical to the realization of low cost, large area electronics. We show that a signature molecular packing motif - side-chain interdigitation - correlates to high performance for a large and ...

32. The Characterization of Silicon-Based Molecular Devices
Published: 9/30/2007
Authors: Nadine Emily Gergel-Hackett, Christina Ann Hacker, Lee J Richter, Oleg A Kirillov, Curt A Richter
Abstract: In order to realize molecular electronic (ME) technology, an intermediate integration with more traditional silicon-based technologies will likely be required. However, there has been little effort to develop the metrology needed to enable the fabric ...

33. Distinguishing Between Nonlinear Channel Transport and Contact Effects in Organic FETs
Published: 8/30/2007
Authors: Behrang H Hamadani, Jeremy LeBoeuf, R J Kline, Iain McCulloch, Martin Heeney, Curt A Richter, Lee J Richter, David J Gundlach
Abstract: We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl)thieno[3,2-b]thiophene) (pBTTT-C14) as the active polymer layer. We show that in high mobility devices where ...

34. Origin of differing reactivities of aliphatic chains on H-Si(111) and oxide surfaces with metal
Published: 6/5/2007
Authors: Christina Ann Hacker, Curt A Richter, Nadine Emily Gergel-Hackett, Lee J Richter
Abstract: The interaction of deposited metals with monolayer films is critical to the understanding of, and ultimate utility of, the emerging arena of molecular electronics. We present the results of a thorough study of the interaction of vapor deposited Au an ...

35. High Carrier Mobility Polythiophene Thin Films: Structure Determination by Experiment and Theory
Published: 3/19/2007
Authors: Dean M DeLongchamp, Regis J Kline, Eric K Lin, Daniel A Fischer, Lee J Richter, Leah A. Lucas, Martin Heeney, Iain McCulloch, John E Northrup
Abstract: We exploit the unprecedented crystallinity of poly(2,5-bis(3-alkylthiophene-2-yl)thieno[3,2-b]thiophenes) (pBTTTs) high performance semiconducting polymers to study structural detail within 25 nm thick films of a pBTTT with tetradecyl side chains (p ...

36. Ordering in Poly (3-alkylthiophene) Thin Films Determined with Polarized Optical Spectroscopies
Published: 3/16/2007
Authors: M C. Gurau, Dean M DeLongchamp, Brandon M. Vogel, Eric K Lin, Daniel A Fischer, S Sambasivan, Lee J Richter

37. Characterization and Control of Lipid Layer Fluidity in Hybrid Bilayer Membranes
Published: 1/31/2007
Authors: Neil A. Anderson, Lee J Richter, John C. Stephenson, Kimberly A Briggman
Abstract: The main gel-to-liquid-crystal (LC) phase transition temperature, Tm, of the distal lipid layer in hybrid bilayer membranes (HBMs) under water was investigated using vibrational sum frequency spectroscopy (VSFS). VSFS has unique sensitivity to order ...

38. Measuring Molecular Order in Poly(3-alkylthiophene) Thin Films with Polarizing Spectroscopies
Published: 1/16/2007
Authors: Marc Gurau, Dean M DeLongchamp, Brandon M. Vogel, Eric K Lin, Daniel A Fischer, S Sambasivan, Lee J Richter
Abstract: We measured the molecular order of poly(3-alkylthiophene) chains in thin films before and after melting through the combination of several polarized photon spectroscopies: infrared (IR) absorption, variable angle spectroscopic ellipsometry (SE), and ...

39. Optical Anisotropy of Semiconducting Single-Wall Carbon Nanotubes
Published: 1/1/2007
Authors: Jeffrey A Fagan, Erik K. Hobbie, Jeffrey Ray Simpson, Lee J Richter, Idan Mandelbaum, Vardhan Bajpai, Derek L. Ho, Barry J. Bauer, Angela HightWalker, Ryan Raffaelle
Abstract: We measure the full optical anisotropy of individual semiconducting single-wall carbon nanotubes (SWNTs). Dispersion of aligned SWNTs in stretched polymer films is confirmed with small-angle scattering and near-infrared fluorescence spectroscopy. By ...

40. Determination of Lipid Phase Transition Temperatures in Hybrid Bilayer Membranes
Published: 9/9/2006
Authors: Neil A. Anderson, Lee J Richter, John C. Stephenson, Kimberly A Briggman
Abstract: The main gel to liquid crystal (LC) phase transition temperature, Tm, of the lipid monolayers in hybrid bilayer membranes (HBMs) was investigated using vibrational sum frequency spectroscopy (VSFS). The unique sensitivity of VSFS to probe order/diso ...

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