Enhanced Mobility of Poly(3-hexylthiophene) Transistors by Spin-Coating from High-Boiling-Point Solvents
By Jui-Fen Chang, Baoquan Sun, D. Breiby, M. Nielsen, T. Sølling, Mark Giles, Iain McCulloch, Henning Sirringhaus. 2004
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Chloroform is a general solvent for poly(3-hexylthiophene) (P3HT) active layers in field-effect transistors. However, its low boiling point and rapid evaporation limit the time for crystallization during the spin-coating process, and field-effect mobilities achieved for P3HT films spin-coated from chloroform are typically on the order of 0.01 cm2/(V s). Here we investigate a range of solvents with higher boiling points. We find that 1,2,4-trichlorobenzene with good solubility and a high boiling point significantly improves the field-effect mobilities up to 0.12 cm2/(V s) with on:off ratios of 106. By controlling the microstructure through the choice of solvent while keeping the molecular weight fixed, we observe a clear correlation between the field-effect mobility and the degree of microcrystalline order as measured by X-ray diffraction, as well as the strength of polaronic relaxation of charge carriers in the accumulation layer as measured by optical spectroscopy of field-induced charge.
Subfields: Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/a99dd70e2a65359445e2cf8fe144b9a2d45bd64c
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In Electrical and Electronic Engineering
Citations in the corpus
- P3HT Revisited – From Molecular Scale to Solar Cell Devices (2014, methodology): “have proposed a relation between the HOMO of the polymer and the open circuit voltage Voc, which was used to estimate the maximum efficiency of bulk-heterojunction solar cells for a number of material combinations, including P3HT and phenyl-C61-butyric acid methyl ester (PCBM) [36].”