Random Copolymers Allow Control of Crystallization and Microphase Separation in Fully Conjugated Block Copolymers

Lee, Youngmin; Aplan, Melissa P.; Seibers, Zach D.; Xie, Renxuan; Culp, Tyler E.; Wang, Cheng; Hexemer, Alexander; Kilbey, S. Michael; Wang, Qing; Gomez, Enrique D.

doi:10.1021/acs.macromol.8b01859

Random Copolymers Allow Control of Crystallization and Microphase Separation in Fully Conjugated Block Copolymers

Journal Article · Mon Oct 29 00:00:00 EDT 2018 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.8b01859· OSTI ID:1656476

Lee, Youngmin ^[1]; Aplan, Melissa P. ^[2]; Seibers, Zach D. ^[3]; ^[2]; Culp, Tyler E. ^[2]; Wang, Cheng ^[4]; Hexemer, Alexander ^[4]; ^[3]; ^[2]; ^[5]

Pennsylvania State Univ., University Park, PA (United States); New Mexico Tech, Socorro, NM (United States)
Pennsylvania State Univ., University Park, PA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Pennsylvania State Univ., University Park, PA (United States); Pennsylvania State Univ., University Park, PA (United States). Materials Research Inst.

Thin films of fully conjugated donor–acceptor block copolymers composed of an electron donating block and an electron accepting block can be used as single component photoactive layers in organic photovoltaic (OPV) devices. In order to realize their full potential, control over microphase separation and thin-film morphology are critical. In conjugated block copolymer systems where one or more blocks can crystallize, the morphological evolution is governed by the competition between microphase separation and crystallization. In this work, we control crystallization of fully conjugated block copolymers with a random copolymer block. Additionally, we suppress the crystal packing of poly(3-hexylthiophene-2,5-diyl) (P3HT) through the insertion of a small number of 3-octylthiophene (3OT) units within the chains, yielding poly(3-hexylthiophene-2,5-diyl-random-3-octylthiophene-2,5-diyl) (P[3HT-r-3OT]). Furthermore, while crystallization of P3HT dominates the morphology and prevents microphase separation in poly(3-hexylthiophene-2,5-diyl)-block-poly((9,9-dioctylfluorene-2,7-diyl)-alt-(4,7-di(thiophene-2-yl)-2,1,3-benzothiadiazole)-5',5"-diyl) (P3HT-b-PFTBT), modest levels of 3OT suppress crystallization in P[3HT-r-3OT]-b-PFTBT, and permit microphase separation. Thus, we demonstrate that incorporating a random copolymer into a donor–acceptor block copolymer can increase control over microphase separation and lead to enhanced performance in OPV devices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1656476

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 21 Vol. 51; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Random Copolymers Allow Control of Crystallization and Microphase Separation in Fully Conjugated Block Copolymers

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