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Title: Effect of Extensional Flow on the Evaporative Assembly of a Donor–Acceptor Semiconducting Polymer

Journal Article · · ACS Applied Electronic Materials

The ability to deposit polymer semiconductors (PSCs) over a large area at near-ambient conditions makes them exciting candidates for low-cost, large-area electronic applications. Given the sensitivity of the charge carrier mobility in PSCs to the nature of their deposition from solution, a mechanistic understanding of deposition processes is essential for enhancing and controlling a PSC’s electrical performance. Polymer chain alignment has been largely posited as a strategy for improving the electrical performance of PSCs. Herein, the ability of a micropillar shearing blade to align polymer chains of poly(2,5-bis(2-octyldodecyl)-3,6-di(thiophen-2-yl)diketopyrrolo[3,4-c]pyrrole-1,4-dione-alt-thieno[3,2-b]thiophen) (DPP-TT) during solution shearing by increasing extensional flow is investigated. A sufficiently strong extensional flow field is found to be capable of aligning polymer chains and inducing crystallization. Such an alignment of crystallite domains is observed to be correlated to increased charge carrier mobility, but the effect of alignment on charge transport is dependent on deposition conditions. Furthermore, the ability of polymer chains to be aligned by using extensional flow, and the effect of alignment on subsequent charge transport, is highly dependent on polymer chain length due to changes in both solution state properties and charge transport mechanisms.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0016523; ECCS-1542152
OSTI ID:
1985485
Alternate ID(s):
OSTI ID: 1782828
Journal Information:
ACS Applied Electronic Materials, Vol. 1, Issue 11; ISSN 2637-6113
Publisher:
ACS PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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