Effect of Polypyrimidine Structure and Purity of Semiconducting SWCNTs on Thin‐Film Transistor Performance

Abstract

AbstractAdvancements in the selective isolation and purification of semiconducting single‐walled carbon nanotubes (SWCNTs) through the use of conjugated polymers have allowed for incorporation of high‐quality SWCNTs into solution‐processed thin‐film transistors (TFTs). In this study, copyrimidine‐alt‐diethynyl, copyrimidine‐alt‐carbazole, and copyrimidine‐alt‐dioctylfluorene that are capable of selectively dispersing semiconducting SWCNTs are reported and obtained polymer/SWCNTs dispersion solution is applied to TFTs for observing relationship between carrier mobilities and purity of sc‐SWCNTs. The exceptional sc‐SWCNT purity of the dispersion is confirmed by UV‐vis and Raman spectroscopy, of which the pyrimidine‐alt‐fluorene polymer‐selected sc‐SWCNT purity is up to 99.9%. On the contrary, among the average carrier mobility of TFTs prepared by the polymer‐SWCNT complex, the carrier mobility based on the pyrimidine‐alt‐ethynyl complex is the highest (4.47 cm2 V−1 s−1). The results indicate that the relationship between carrier mobility and sc‐SWCNTs purity reveals that polymer structure has great impact more than sc‐SWCNTs purity.