ACS Applied Polymer Materials · 2020 · 12 citations · 21 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials ChemistryPolymer ChemistryPolymer MaterialsConducting PolymersConductive PolymersOrganic Electronic MaterialsOrganic SemiconductorsPolymer Thin FilmsSemiconductor Device MaterialsCarrier Transport In Organic SemiconductorsCharge TransportCrystallinityLow-temperature ProcessingOrganic ElectronicsOrganic Field-effect TransistorsSynthesis Of Conducting PolymersThermal Transitions
Complementary semiconducting polymer blends (c-SPBs) have been demonstrated as an effective approach to balance performance and processing of semiconducting polymers for organic field-effect transistors. All previously reported c-SPBs have been exclusively based on p-type polymers. In this report, we designed and synthesized naphthalene diimide (NDI) based matrix polymers and systematically studied n-type charge transport behaviors of their corresponding polymer blends. NDI-Cm (m = 3–7) polymers displayed low melting points (55–105 °C) allowing for the lowest temperature melt-processing of organic transistors to date with mobilities up to 1.01 × 10–3 cm2 V–1 s–1. NDI-Cm polymers were revealed to be nearly amorphous by GIXRD and thin film UV–vis which explain the lowered thermal transitions and observed poor charge transport. Utilizing a c-SPB with 5% fully conjugated P(NDI2OD-T2), the transistor performance improved up to 100-fold of the pure matrix polymer despite the low crystallinity of NDI-Cm thin films.
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