期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 1, 页码 999-1007出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16676
关键词
conjugated polymers; polymer tie chains; field-effect transistors; organic electronics; charge transport
资金
- ExxonMobil
- National Science Foundation (NSF) [CMMI-1824674]
- NSF Materials Research Science and Engineering Center Program through the Princeton Center for Complex Materials [DMR-1420541]
- NSF [DMR-1708317]
- State of Washington through the University of Washington Clean Energy Institute
- Washington Research Foundation
- U.S. DOE Office of Science Facilities, at Brookhaven National Laboratory [DE-SC0012704]
Thermal annealing of P3HT thin films generally increases their crystallinity and coherence length, but can reduce transistor mobility at high temperatures. The tie-chain pullout phenomenon may govern charge transport during crystal growth and perfection, particularly in low-molecular-weight systems.
The performance of electronic devices comprising conjugated polymers as the active layer depends not only on the intrinsic characteristics of the materials but also on the details of the extrinsic processing conditions. In this study, we examine the effect of postdeposition thermal treatments on the microstructure of poly(3-hexylthiophene) (P3HT) thin films and its impact on their electrical properties. Unsurprisingly, we find thermal annealing of P3HT thin films to generally increase their crystallinity and crystallite coherence length while retaining the same crystal structure. Despite such favorable structural improvements of the polymer active layers, however, thermal annealing at high temperatures can lead to a net reduction in the mobility of transistors, implicating structural changes in the intercrystallite amorphous regions of these semicrystalline active layers take place on annealing, and the simplistic picture that crystallinity governs charge transport is not always valid. Our results instead suggest tie-chain pullout, which occurs during crystal growth and perfection upon thermal annealing to govern charge transport, particularly in low-molecular-weight systems in which the tie-chain fraction is low. By demonstrating the interplay between intracrystallite and intercrystallite structuring in determining the macroscopic charge transport, we shed light on how structural evolution and charge-transport properties of nominally the same polymer can vary depending on the details of processing.
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