Polymers containing the 1,4-diketo-pyrrolo [3,4-c]pyrrole (diketopyrrolopyrrole, DPP) unit are highly desirable for optoelectronic devices. However, the requirements for the substituents flanking the DPP unit at the 3,6-positions are limited to aryl groups due to the lack of synthetic methods to prepare other substituted DPP. This paper describes the synthesis, characterization, and application of the first vinyl-flanked DPP polymers: DPP-vinylthiophene-vinyl (PDPPVTV) and DPP-vinyl-thiophene-thiophene (PDPPVTT). The position of the vinyl group is varied to determine its effect on the physical and optoelectrical properties of the polymers. The semicrystalline polymers record moderate molecular weights (M n ∼ 25−30 kDa), good solubility in chloroform, and high thermal stabilities (T d onset ∼ 400 °C). Both polymers have broad absorption bands in the solid state (abs λ max ∼ 800 nm) that extend into the nearinfrared (NIR) region (900−1000 nm). PDPPVTT has two orders of magnitude higher hole mobility than PDPPVTV (0.25 vs 0.0018 cm 2 V −1 s −1 ) and is used as a coating material in a MoS 2 FET device. The PDPPVTT/2D MoS 2 hybrid device shows higher photoresponsivity in the NIR region (10 3 A/W at 800 nm and 10 2 A/W at 1050 nm) than the pristine MoS 2 photodetector (10 2 A/ W at 800 nm and 0 A/W at 1050 nm).

Rhodamine dyes are known for their excellent photoluminescence properties but not commonly known for their electrical conductivity or redox stability. They are usually found as pendants (sidechains) attached to a...