Structure and properties of small molecule-polymer blend semiconductors for organic thin film transistors

Journal of the American Chemical Society
Jihoon KangDo Y Yoon

Abstract

A comprehensive structural and electrical characterization of solution-processed blend films of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) semiconductor and poly(alpha-methylstyrene) (PalphaMS) insulator was performed to understand and optimize the blend semiconductor films, which are very attractive as the active layer in solution-processed organic thin-film transistors (OTFTs). Our study, based on careful measurements of specular neutron reflectivity and grazing-incidence X-ray diffraction, showed that the blends with a low molecular-mass PalphaMS exhibited a strong segregation of TIPS-pentacene only at the air interface, but surprisingly the blends with a high molecular-mass PalphaMS showed a strong segregation of TIPS-pentacene at both air and bottom substrate interfaces with high crystallinity and desired orientation. This finding led to the preparation of a TIPS-pentacene/PalphaMS blend active layer with superior performance characteristics (field-effect mobility, on/off ratio, and threshold voltage) over those of neat TIPS-pentacene, as well as the solution-processability of technologically attractive bottom-gate/bottom-contact OTFT devices.

Citations

Jul 3, 2013·ACS Applied Materials & Interfaces·Satej S DharmapurikarKothandam Krishnamoorthy
Feb 24, 2017·Chemistry : a European Journal·Kamal SbargoudMichel Frigoli
Feb 2, 2015·Journal of Colloid and Interface Science·Sudeshna Roy, Ashutosh Sharma
Jul 20, 2018·Advanced Materials·Alexandra F PatersonThomas D Anthopoulos
Jan 26, 2018·Reports on Progress in Physics·A R Hall, M Geoghegan
Jan 29, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jasper J Michels
Apr 3, 2019·Advanced Science·Seungjun ChungTakhee Lee
Apr 21, 2010·ACS Nano·Benjamin J RancatoreTing Xu
Jun 26, 2021·ACS Applied Materials & Interfaces·Jake A McEwanIan R Gentle
Feb 1, 2019·ACS Applied Materials & Interfaces·Vivek RaghuwanshiShree Prakash Tiwari
Dec 16, 2010·Journal of the American Chemical Society·Yeon Sook ChungDo Y Yoon

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