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Search Publications by: Dean DeLongchamp (Fed)

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Displaying 176 - 200 of 231

Critical Role of Side-Chain Attachment Density on the Order and Device Performance of Polythiophenes

October 30, 2007
Author(s)
Regis J. Kline, Dean DeLongchamp, Daniel A. Fischer, Eric K. Lin, Lee J. Richter, Michael L. Chabinyc, Martin Heeney, Iain McCulloch
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

High Carrier Mobility Polythiophene Thin Films: Structure Determination by Experiment and Theory

March 19, 2007
Author(s)
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
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 (pBTTT

Controlling Diffusion and Exchange in Layer-by-Layer Assemblies

March 6, 2007
Author(s)
Nicole Zacharia, Dean DeLongchamp, Miguel Modestino, P T. Hammond
Here we present a layer-by-layer (LbL) assembled device architecture that serves as a model heterostructure to study the atypical assembly that can result from the bottom-up combination of multiple multilayers of different compositions. Heterostructure

Measuring Molecular Order in Poly(3-alkylthiophene) Thin Films with Polarizing Spectroscopies

January 16, 2007
Author(s)
Marc Gurau, Dean DeLongchamp, Brandon M. Vogel, Eric K. Lin, Daniel A. Fischer, S Sambasivan, Lee J. Richter
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 near

Combinatorial screening of the effect of temperature on the microstructure and mobility of a high performance polythiophene semiconductor

January 1, 2007
Author(s)
Leah A. Lucas, Dean M. DeLongchamp, Brandon M. Vogel, Eric K. Lin, Michael J. Fasolka, Daniel A. Fischer, Iain McCulloch, Martin Heeney, Ghassan Jabbour
Using a gradient combinatorial approach, the authors report the effects of temperature on the microstructure and hole mobility of poly2,5-bis3-dodecylthiophen-2ylthieno3,2-bthiophene thin films for application in organic field-effect transistors. The

Thickness Dependence of Microstructure in Semiconducting Films of an Oligofluorene Derivative

December 7, 2006
Author(s)
Dean M. DeLongchamp, Mang-Mang Ling, Youngsuk Jung, Daniel A. Fischer, Mark Roberts, Eric K. Lin, Zhenan Bao
The measurement and optimization of microstructure development in organic semiconductor films is valuable because microstructure in many cases critically impacts electronic performance. We demonstrate a general method to measure microstructure thickness