TITLE

Solvent effects and multiple aggregate states in high-mobility organic field-effect transistors based on poly(bithiophene-alt-thienothiophene)

AUTHOR(S)
Wang, Shuai; Tang, Jie-Cong; Zhao, Li-Hong; Png, Rui-Qi; Wong, Loke-Yuen; Chia, Perq-Jon; Chan, Hardy S. O.; Ho, Peter K.-H.; Chua, Lay-Lay
PUB. DATE
October 2008
SOURCE
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p162103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Franck–Condon absorption analysis reveals the existence of several aggregate states in poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) thin films which impact their recrystallization and the attainable field-effect mobility (μFET). Poor solvents (toluene and mixed-xylenes) lock in both disordered and well-ordered states that cannot be annealed away even in the liquid crystalline phase. This reduces μFET and increases mobility activation energies compared with films from good solvents (chlorobenzene and o-dichlorobenzene). Despite its poor solubility characteristics, PBTTT can be ink-jet printed in dilute chlorobenzene, and devices can be operated unencapsulated in ambient, in the dark (>105 cycles over several days) with only a moderate mobility loss.
ACCESSION #
35279337

 

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