Stable polythiophene semiconductors incorporating thieno[2,3-b]thiophene.
This work describes a new design methodology that allows the preparation of air stable, semiconducting thiophene polymers with high charge carrier mobilities. The incorporation of thieno[2,3-b]thiophene into a polythiophene backbone introduces cross-conjugated double bonds that disfavor full delocalization, leading to high ionization potential in comparison to a fully conjugated polythiophene, with no reduction in charge carrier mobility. The resulting solution processable polymers exhibit charge carrier mobilities up to 0.15 cm2/V s and on/off ratios greater than 105 when measured in air. Transistors exhibit lifetimes of several months in air with no encapsulation necessary.
Heeney
Martin
M
Merck Chemicals, Chilworth Technical Centre, Southampton, United Kingdom.
Bailey
Clare
C
Genevicius
Kristijonas
K
Shkunov
Maxim
M
Sparrowe
David
D
Tierney
Steve
S
McCulloch
Iain
I