Oligothiophenes morphology

Mobilities up to 1.5 cm2 V-1 s 1 have been obtained for films deposited on hcale substrates [94—96]. As in the case of oligothiophenes, this has been attributed to a highly ordered morphology, close to that of a single crystal [94]. However, high values are only obtained under very acute deposition parameters (in particular an opti... 

Wynands D, Levichkova M, Riede M, Pfeiffer M, Baeuerle P, Rentenberger R, Dernier P, Leo K (2010) Correlation between morphology and performance of low bandgap oligothiophene C6o mixed heterojunctions in organic solar cells. J Appl Phys 107 6... 

Torsi, L. et al., Correlation between oligothiophene thin fihn transistor morphology and... 

Rittner, M. et al., Oligothiophenes of DDnT and DPnT type Morphology, field effect... 

Chang, PC. et al., Film morphology and thin film transistor performance of solution-processed oligothiophenes, Chem. Mater 16, 4783 789, 2004. 

This section will therefore examine several unipolar blend systems that have been employed to improve OFET mobility, to enhance processability especially with a view to printing devices, to study the links between morphology and charge transport, and finally to enable novel fabrication techniques such as gate dielectric self-assembly. We will broadly divide the section into blends based on oligothiophenes and those based on acenes since this covers a large fraction of the materials and concepts investigated to date. 

A further study on the morphology and the photoresponse of blends of P3HT with oligothiophene-5,5-dioxide T50HM [87] (Figure 4.15) revealed the occurrence of a notable phase segregation between the two... 

In this section the morphology of oligothiophene thin films will be reviewed. In particular the orientation of the molecules with respect to the substrate normal and the long-range order will be discussed. 

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