Organic Semiconductor–Insulator Blends for Organic Field‐Effect Transistors

Abstract

Extensive progress has been made on the application of organic semiconductors (OSCs) in organic field‐effect transistors (OFETs); however, low reproducibility and poor stability of OSCs have limited their industrial applications. One potential strategy to overcome these limitations is to blend OSCs with insulating commodity polymers. The resultant bicomponent blends can be used to fabricate OFETs with low cost, high performance, and long‐time retention. In addition, insulator blending is also identified as a facile and effective approach to enhance the OSC properties, with some unexpected features even superior to neat OSCs. Herein, the present advances of OSCs/insulator blends in the OFET configuration are reviewed. The perspectives on the intrinsic properties of insulator blends, including morphology and trap elimination, are presented for the purpose of strategic device optimization. Accordingly, the effect of different insulator components on device performance is also discussed.

A General Strategy for Enhancing Sensitivity and Suppressing Noise in Infrared Organic Photodetectors Using Non‐Conjugated Polymer Additives

“…PS and PMMA were chosen based on their ability to improve device performance by diluting the trap states encountered by charges and through tuning the existing OSC morphology. [26][27][28]36,37] Narrow bandgap conjugated polymers such as CDT-TQ are inherently more rigid that traditional semiconducting polymers, a structural feature that enables extended 𝜋-conjugation and interactions with longer wavelength light. It is well-established that rigid-rod and coiled macromolecules (PS and PMMA in this case) are highly immiscible [38] ; thus, we also evaluated PSU, a rigid-rod aromatic thermoplastic.…”

“…These results starkly contrast those achieved in OPVs, where the addition of insulators increased EQE. [26][27][28]36,37] However, more optimal materials combinations may provide a similar enhancement. Table 1 summarizes the performance parameters of ternary CDT-TQ:PC 71 BM OPDs incorporating PS, PMMA, and PSU at 15, 30, and 45 wt%.…”

Heat Transfer Enhancement of n-Type Organic Semiconductors by an Insulator Blend Approach

“…It has been reported that the molecular weight (MW) (or the chain length) of the insulating polymer has a substantial impact on the device performances of OSC/insulator blends. 17,34,35 To investigate the MW effect, we used another high-MW PS, 1000 kDa PS, to fabricate blended OFETs, as shown in Figure S11a. Unlike previous blends with lower MW 4 kDa of PS, the I off of the devices blended with 1000 kDa PS undergoes an upward shift, even higher than the neat PC 71 BM device.…”

High throughput processing of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) organic semiconductors

“…This can be often overcome by using more viscous inks based on blends of OSCs and insulating polymers. [9][10][11][12][13][14][15][16][17][18] Furthermore, the use of blends has also often been shown to give rise to more crystalline films exhibiting lower interfacial traps thanks to the passivation of the dielectric by the binding polymer. 19 In addition, the solubility of the OSC is crucial to being able to process the material by solution shearing.…”