Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3148332
Keywords
boiling point; conducting polymers; electrical conductivity; hysteresis; organic semiconductors; polymer films; solidification; spin coating; thin film transistors; vacancies (crystal); vacuum deposition
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Funding
- National Science Council of Taiwan [NSC97-2221-E-006-245]
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The role of residual solvents and vacancies within poly(3-hexylthiophene) (P3HT) active layers, which are made from different boiling point (bp) solvents, on the electrical hysteresis characteristics of P3HT-based transistors was investigated. The improved electrical performance and reduced hysteresis of P3HT films, which are spin coated by high bp solvents, can be interpreted by superior crystalline quality and homogeneity and low vacancies. The hysteresis is dominated by the vacancy-related charge traps in the semiconductor created during film solidification and subsequence solvent evaporation. Furthermore, residual solvents, which initially occupied the vacancies, can contribute to conductivity of regioregular P3HT, thus altering electrical properties and smaller hysteresis.
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