Unexpectedly high field-effect mobility of a soluble, low molecular weight oligoquaterthiophene fraction with low polydispersity

• Published in: Applied physics. A, Materials science & processing Vol. 95; no. 1; pp. 67 - 72
• Main Authors: Pingel, Patrick, Zen, Achmad, Neher, Dieter, Lieberwirth, Ingo, Wegner, Gerhard, Allard, Sybille, Scherf, Ullrich
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2009; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Current carriers; Low molecular weights; Machines; Manufacturing; Materials science; Molecular structure; Molecular weight; Nanotechnology; Optical and Electronic Materials; Physics; Polydispersity; Polythiophene; Processes; Proximity; Surfaces and Interfaces; Thin Films; Transport properties; 78.66.Qn; 81.05.Lg; 68.55.-a; 85.30.Tv; 73.61.Ph
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-008-4994-0

Layers made from soluble low molecular weight polythiophene PQT-12 with low polydispersity exhibit a highly ordered structure and charge-carrier mobilities of the order of 10
−3
 cm
2
/(V s), which we attribute to its proximity to monodispersity. We propose that polydispersity is a decisive factor with regard to structure formation and transport properties of soluble low molecular weight polythiophenes.