title: Ordering rigid rod conjugated polymer molecules for high performance photoswitchers.
abstract: Molecules of a rigid rod conjugated polymer, a derivative of poly(para-phenylene ethynylene)s with thioacetyl end groups (TA-PPE), were well aligned by drop-casting the polymer solution onto the friction-transferred poly(tetrafluoroethylene) substrates. TA-PPE molecules were found to be exactly oriented with their conjugated backbones along the PTFE sliding direction. Photoresponse characteristics based on the uniaxially ordered film were significantly improved compared to those of devices with the disordered film. For example, the switch on/off ratio of the photoswitchers with aligned molecules was as high as 330-400, while that of devices without alignment was only 8-12. It was due to the efficient carrier transport along the highly aligned polymer films, in which the molecules of TA-PPE oriented along the carrier transport direction of the devices.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Huanli
authors.initials: H
authors.lastname: Dong
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Li
authors.forename: Erjing
authors.initials: E
authors.lastname: Wang
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Wei
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
authors.forename: Shouke
authors.initials: S
authors.lastname: Yan