Role of Solution Structure in Self-Assembly of Conjugated Block Copolymer Thin Films

Brady, Michael A.; Ku, Sung-Yu; Perez, Louis A.; Cochran, Justin E.; Schmidt, Kristin; Weiss, Thomas M.; Toney, Michael F.; Ade, Harald; Hexemer, Alexander; Wang, Cheng; Hawker, Craig J.; Kramer, Edward J.; Chabinyc, Michael L.

doi:10.1021/acs.macromol.6b01686

Title: Role of Solution Structure in Self-Assembly of Conjugated Block Copolymer Thin Films

Journal Article · Mon Oct 24 00:00:00 EDT 2016 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.6b01686· OSTI ID:1377576

Brady, Michael A. ^[1]; Ku, Sung-Yu ^[1]; Perez, Louis A. ^[1]; Cochran, Justin E. ^[2]; Schmidt, Kristin ^[3]; Weiss, Thomas M. ^[3]; Toney, Michael F. ^[3]; Ade, Harald ^[4]; Hexemer, Alexander ^[5]; Wang, Cheng ^[5]; Hawker, Craig J. ^[6]; Kramer, Edward J. ^[7]; Chabinyc, Michael L. ^[1]

Univ. of California, Santa Barbara, CA (United States). Materials Dept.
Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry and Biochemistry
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Univ. of California, Santa Barbara, CA (United States). Materials Dept. Dept. of Chemistry and Biochemistry
Univ. of California, Santa Barbara, CA (United States). Materials Dept. Dept. of Chemical Engineering

Conjugated block copolymers provide a pathway to achieve thermally stable nanostructured thin films for organic solar cells. We characterized the structural evolution of poly(3-hexylthiophene)-block-poly(diketopyrrolopyrrole–terthiophene) (P3HT-b-DPPT-T) from solution to nanostructured thin films. Aggregation of the DPPT-T block of P3HT-b-DPPT-T was found in solution by small-angle X-ray scattering with the P3HT block remaining well-solvated. The nanostructure in thin films was determined using a combination of wide and small-angle X-ray scattering techniques as a function of processing conditions. The structure in solution controlled the initial nanostructure in spin-cast thin films, allowing subsequent thermal annealing processes to further improve the ordering. In contrast to the results for thin films, nanostructural ordering was not observed in the bulk samples by small-angle X-ray scattering. Finally, these results suggest the importance of controlling solvent induced aggregation in forming nanostructured thin films of conjugated block copolymers.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Contributing Organization:: North Carolina State Univ., Raleigh, NC (United States)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; AC02-98CH10886; DMR 1207549; DMR 1207032; DMR 1121053

OSTI ID:: 1377576

Alternate ID(s):: OSTI ID: 1349415

Journal Information:: Macromolecules, Vol. 49, Issue 21; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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36 MATERIALS SCIENCE
14 SOLAR ENERGY
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semiconducting polymer
conjugated block copolymer
solution self-assembly
organic photovoltaics
thin film X-ray scattering

Title: Role of Solution Structure in Self-Assembly of Conjugated Block Copolymer Thin Films

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