We report a directly photopatternable polythiophene derivative PToNB with o-nitrobenzyl (oNB)-functionalized side chains. PToNB has unique phototunable solubilities programmed through three stages: (i) organic-soluble/aqueous-insoluble, (ii) organic-insoluble/aqueous-insoluble, and (iii) organic-insoluble/aqueous soluble. The capability to control conjugated polymer solubility with spatiotemporal ... read moreprecision and orthogonal developer solvents through three stages allows for direct patterning of this conjugated polymer and provides flexibility to choose between positive and negative tone photolithography. This approach to photomodulate solubility also enables all-solution processing of multilayer stacked conjugated polymer films; we demonstrate here direct two-layer photopatterning with this novel conjugated polymer photoresist.read less
Hu, X.; Lawrence, J. A. III; Mullahoo, J.; Smith, Z. C.; Wilson, D. J.; Mace, C. R.; Thomas, S. W. III "Directly Photopatternable Polythiophene as Dual-Tone Photoresist" Macromolecules, 2017, 50, 7258-7267.