Semiconducting polymer blends that exhibit stable charge transport at high temperatures

Abstract

Although high-temperature operation (i.e., beyond 150°C) is of great interest for many electronics applications, achieving stable carrier mobilities for organic semiconductors at elevated temperatures is fundamentally challenging. We report a general strategy to make thermally stable high-temperature semiconducting polymer blends, composed of interpenetrating semicrystalline conjugated polymers and high glass-transition temperature insulating matrices. When properly engineered, such polymer blends display a temperature-insensitive charge transport behavior with hole mobility exceeding 2.0 cm2/V·s across a wide temperature range from room temperature up to 220°C in thin-film transistors.

Nonlinear Nonacenes with a Dithienothiophene Substructure: Multifunctional Compounds that Act as Columnar Mesogens, Luminophores, π Gelators, and p‐Type Semiconductors

“…The TOF μ value of 10 −3 cm 2 V −1 s −1 for these compounds is comparable to the value of other discotic columnar mesogens recently reported, and much higher than for π‐conjugated oligothiophene hexacatenar (Col tet and Col hex ) mesogens . One important feature here is the stability of μ at high temperature and over a large temperature range, which makes it very attractive for its incorporation in displays . This result demonstrates the advantage of larger π‐aromatic systems and stronger intermolecular S…S extended orbital overlaps, within highly cohesive Col hex mesophases.…”

“…[27] One important feature here is the stability of μ at high temperature and over a large temperature range, which makes it very attractive for its incorporation in displays. [66] This result demonstrates the advantage of larger π-aromatic systems and stronger intermolecular S…S extended orbital overlaps, within highly cohesive Col hex mesophases.…”

Glass Transition Phenomenon for Conjugated Polymers

“…There are studies reporting the temperature‐dependent optical and charge transport property . The mobility of the conjugated polymer typically increases with increasing temperature due to high activation energy, but eventually drops due to unstable morphologies and disrupted molecular packing . It should be noted that when performing such work, one need to decouple two intertangled effects: 1) influence from activation energy for hopping of the charge carrier and 2) changes originating from chain dynamics.…”

Challenge and Solution of Characterizing Glass Transition Temperature for Conjugated Polymers by Differential Scanning Calorimetry

“…Such process needs to be carried out at a temperature above T g to accelerate molecular dynamics. Additionally, operating devices above its T g would cause change in the device morphology and potentially cause performance degradation over time . As such, it is important to know the T g of the CPs.…”