Products Cited in Publications Worldwide Mixed Ionic‐Electronic Transport in A Series of New Cyano‐Functionalized N‐Type Conjugated Ladder Copolymers

Mixed Ionic‐Electronic Transport in A Series of New Cyano‐Functionalized N‐Type Conjugated Ladder Copolymers

Tran, Duyen K; West, Sarah M; Stewart, Anna E; Kaminsky, Werner; Jenekhe, Samson A

DOI:

Abstract

N-type conjugated ladder polymers without side chains, such as BBL, have been shown to exhibit record-high mixed ionic-electronic transport properties, which have enabled diverse device applications. This study reports herein the design and synthesis of a series of dicyano-functionalized n-type conjugated ladder copolymers, BBL-x2CN, as new organic mixed ionic-electronic conductors (OMIECs). By combining the cyanation and random copolymerization design motifs, this study demonstrates that the electronic band structure (LUMO/HOMO energy levels) can be effectively tuned as a function of the copolymer composition of the dicyano functional group without compromising the unique planar polymer backbone intrinsic to BBL-type ladder polymers. Optimal mixed ionic-electronic transport properties probed via organic electrochemical transistors (OECTs) are found in BBL-202CN (20 mol%) devices that feature a high transconductance (≈3 mS), a good µC* value (≈2.8 FV−1cm−1s−1), and a fast transient response (τon/τoff = 40 ms/12 ms), which are substantially enhanced compared to those of the parent BBL of comparable molecular weight. The better OECT device performance found in BBL-202CN copolymer, compared to other copolymers, can be explained by a combination of improved crystallinity, delocalization length, and suppressed conformational disorder. These results provide new structure-property relationships with implications for the molecular engineering of high-performance n-type OMIECs.

Keywords

onjugated ladder polymers ; cyanation ; n-type conjugated polymers ; organic electrochemical transistors ; organic mixed ionic-electronic conductors ; random copolymers

Purchased from AmBeed

Y15

A1910994506-66-597%

Y15

22.0/250mg

Detail

A356688128-97-295% （contains anhydrides）

Naphthalene-1,4,5,8-tetracarboxylic acid

113.0/100g

Detail