Microtech2010 2010

Optimising the properties of TIPS-pentacene: polystyrene thin film transistors by inkjet printing

M.-B. Madec, P.J. Smith, J.G. Korvink, S.G. Yeates
University of Manchester, UK

Keywords: thin film, morphology, OFET


Interest in inkjet printing of organic semiconductors is growing on account of its additive, low waste nature. Inkjet printing also offers other advantages such as improved device performance and increased control over the morphology of the thin film. Low cost processability is offered by using a multi-component system, which involves diluting the active compound into a cheap dielectric matrix whilst retaining good saturated mobility. In this presentation, we report on the use of inkjet printing in the preparation of organic field effect transistors (OFETs) which are based on a blend of the semiconductor 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) and polystyrene. The inkjet printed OFETs exhibit significantly improved performance, compared to drop-cast OFETs. Two types of ink were printed: single solvent or dual solvent formulation with the aim to improve film morphology.Interestingly OFETs prepared using the single solvent blend showed remarkably low variances in mobility values of 24%.This value decreases as layer number increases. OFETs prepared from the dual solvents formulation reached an exceptional maximum mobility of 0.11 cm2/Vs. Thin film morphology was assessed by AFM, XPS, XRD and selective solvent etching.
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