Background: Symmetrically substituted pentacenes have been traditionally used as semiconductors
for solution-processed p-channel Organic Field Effect Transistors (OFETs). The aims of
this paper are to introduce asymmetrically substituted pentacenes in the active layer and to examine
the impact of the polyaromaticity of the pendant groups on the device characteristics.
Methods: Research and online content related to asymmetrically substituted pentacenes is reviewed,
the synthesis of the different pentacenes is described and the procedure used to introduce these semiconductors
in devices is detailed. Comparison with a reference material is provided.
Results: Extension of the polyaromaticity of the pendant group of pentacene greatly contributes to enhance
the device performances. Impact of the pendant group on the morphology of the active layer is
evidenced by the roughness decreasing with the increase of aromatic ring in the substituent.
Conclusion: We demonstrate the extension of the π-conjugation of the aromatic end-group to drastically
impact both ON/OFF ratio and charge carrier mobilities, mainly due to various degree of crystal
formation characteristics in the film. Best results were obtained with the most extended one, namely
the anthracene moiety which showed a mobility comparable to that of the benchmark TIPS-pentacene
with OFETs that used hexamethyldisilazane as the gate dielectric passivation layer.