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Gann, Eliot,Caironi, Mario,Noh, Yong-Young,Kim, Yun-Hi,McNeill, Christopher R. American Chemical Society 2018 Macromolecules Vol.51 No.8
<P>The depth dependence of crystalline structure within thin films is critical for many technological applications but has been impossible to measure directly using common techniques. In this work, by monitoring diffraction peak intensity and location and utilizing the highly angle-dependent waveguiding effects of X-rays near grazing incidence, we quantitatively measure the thickness, roughness, and orientation of stratified crystalline layers within thin films of a high-performance semiconducting polymer. In particular, this diffractive X-ray waveguiding reveals a self-organized 5 nm thick crystalline surface layer with crystalline orientation orthogonal to the underlying 65 nm thick layer. While demonstrated for an organic semiconductor film, this approach is applicable to any thin film material system with stratified crystalline structure where orientation can influence important interfacial processes such as charge injection and field-effect transport.</P> [FIG OMISSION]</BR>
Charge‐Transport Anisotropy in a Uniaxially Aligned Diketopyrrolopyrrole‐Based Copolymer
Schott, Sam,Gann, Eliot,Thomsen, Lars,Jung, Seok‐,Heon,Lee, Jin‐,Kyun,McNeill, Christopher R.,Sirringhaus, Henning John Wiley and Sons Inc. 2015 Advanced Materials Vol.27 No.45
<P><B>Aligned films of a semiconducting DPP‐based copolymer</B> exhibit highly anisotropic charge transport with a band‐like temperature dependence along the alignment direction and hole mobilities of up to 6.7 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. X‐ray diffraction measurements reveal an exceptional degree of in‐plane alignment, high crystallinity, and a dominant face‐on orientation of the polymer backbones. The surprising charge‐transport properties are interpreted in a tie‐chain model consistent with anisotropic activation energies. </P>
Design of New Isoindigo-Based Copolymer for Ambipolar Organic Field-Effect Transistors
Shin, Eun-Sol,Ha, Yeon Hee,Gann, Eliot,Lee, Yun-Ji,Kwon, Soon-Ki,McNeill, Christopher R.,Noh, Yong-Young,Kim, Yun-Hi American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.16
<P>We report the synthesis of a new conjugated polymer composed of isoindigo (IID) and 2,3-bis[thiophenyl-2-yl]thiophene acrylonitrile (CNTVT) subunits for high-performance n-type organic field-effect transistors (OFETs). To realize high electron mobility for the IID-based conjugated polymer, an electron-withdrawing nitrile group is incorporated into the vinylene unit, thereby shifting the energy of the lowest unoccupied molecular orbital for efficient electron injection from Au electrodes without disrupting the backbone planarity. Uniaxially aligned IID<SUB>24</SUB>-CNTVT-conjugated polymer films for efficient intramolecular charge transport are achieved by off-center spin-coating from preaggregated solutions. To obtain its stable preaggregation in solution, a binary solvent system (a mixture of good and bad solvents) chosen with the assistance of Hansen solubility parameter simulation is used. Through this process, highly aligned IID<SUB>24</SUB>-CNTVT films are obtained by off-center spin coating from a solvent mixture of 9:1 dichlorobenzene/2-methoxyethanol as the good and bad solvents, respectively. The properties of the aligned IID<SUB>24</SUB>-CNTVT films are characterized with various analytical techniques, including UV-visible absorption spectroscopy, angle-resolved near-edge X-ray absorption fine structure spectroscopy, and grazing-incidence wide-angle X-ray scattering. Top-gate/bottom-contact OFETs with IID<SUB>24</SUB>-CNTVT films aligned in the direction of charge transport exhibit a high-electron field-effect mobility of 0.83 ± 0.13 cm<SUP>2</SUP>/V·s.</P> [FIG OMISSION]</BR>
IUPAC-PSK40: N-Channel Organic Field-Effect Transistors and Structure-Property Relationship
Min Jae Sung,Alessandro Luzio,Won-Tae Park,Ran Kim,Eliot Gann,Francesco Maddalena,Giuseppina Pace,Yong Xu,Dario Natali,Carlo de Falco,Long Dang,Christopher R. McNeill,Mario Caironi,Yong-Young Noh,Yun- 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2