TY - JOUR
T1 - Vertically segregated structure and properties of small molecule-polymer blend semiconductors for organic thin-film transistors
AU - Shin, Nayool
AU - Kang, Jihoon
AU - Richter, Lee J.
AU - Prabhu, Vivek M.
AU - Kline, R. Joseph
AU - Fischer, Daniel A.
AU - Delongchamp, Dean M.
AU - Toney, Michael F.
AU - Satija, Sushil K.
AU - Gundlach, David J.
AU - Purushothaman, Balaji
AU - Anthony, John E.
AU - Yoon, Do Y.
PY - 2013/1/21
Y1 - 2013/1/21
N2 - A comprehensive structure and performance study of thin blend films of the small-molecule semiconductor, 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TESADT), with various insulating binder polymers in organic thin-film transistors is reported. The vertically segregated composition profile and nanostructure in the blend films are characterized by a combination of complementary experimental methods including grazing incidence X-ray diffraction, neutron reflectivity, variable angle spectroscopic ellipsometry, and near edge X-ray absorption fine structure spectroscopy. Three polymer binders are considered: atactic poly(α-methylstyrene), atactic poly(methylmethacrylate), and syndiotactic polystyrene. The choice of polymer can strongly affect the vertical composition profile and the extent of crystalline order in blend films due to the competing effects of confinement entropy, interaction energy with substrate surfaces, and solidification kinetics. The variations in the vertically segregated composition profile and crystalline order in thin blend films explain the significant impacts of binder polymer choice on the charge carrier mobility of these films in the solution-processed bottom-gate/bottom-contact thin-film transistors. Vertical phase segregation in blend films of an organic small molecule semiconductor, diF-TESADT, and various binder polymers are investigated. Comprehensive structural analysis reveals that the choice of polymer can strongly affect the structure of blend films due to the competing effects of confinement entropy, interaction energy, and solidification kinetics.
AB - A comprehensive structure and performance study of thin blend films of the small-molecule semiconductor, 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TESADT), with various insulating binder polymers in organic thin-film transistors is reported. The vertically segregated composition profile and nanostructure in the blend films are characterized by a combination of complementary experimental methods including grazing incidence X-ray diffraction, neutron reflectivity, variable angle spectroscopic ellipsometry, and near edge X-ray absorption fine structure spectroscopy. Three polymer binders are considered: atactic poly(α-methylstyrene), atactic poly(methylmethacrylate), and syndiotactic polystyrene. The choice of polymer can strongly affect the vertical composition profile and the extent of crystalline order in blend films due to the competing effects of confinement entropy, interaction energy with substrate surfaces, and solidification kinetics. The variations in the vertically segregated composition profile and crystalline order in thin blend films explain the significant impacts of binder polymer choice on the charge carrier mobility of these films in the solution-processed bottom-gate/bottom-contact thin-film transistors. Vertical phase segregation in blend films of an organic small molecule semiconductor, diF-TESADT, and various binder polymers are investigated. Comprehensive structural analysis reveals that the choice of polymer can strongly affect the structure of blend films due to the competing effects of confinement entropy, interaction energy, and solidification kinetics.
KW - blend semiconductors
KW - charge transport
KW - organic thin-film transistors
KW - vertical phase segregation
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U2 - 10.1002/adfm.201201389
DO - 10.1002/adfm.201201389
M3 - Article
AN - SCOPUS:84872320002
SN - 1616-301X
VL - 23
SP - 366
EP - 376
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 3
ER -