Charge photogeneration and transport in side-chain carbazole polymers and co-polymers

Li, Huawei; Termine, Roberto; Godbert, Nicolas; Angiolini, Luigi; Giorgini, Loris; Golemme, Attilio

Charge photogeneration and transport in side-chain carbazole polymers and co-polymers

Type

Article

Authors

Li, Huawei
Termine, Roberto
Godbert, Nicolas
Angiolini, Luigi
Giorgini, Loris
Golemme, Attilio

KAUST Department

Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Physical Science and Engineering (PSE) Division

Date

2011-07

Abstract

The photoconductivity, hole mobility and charge photogeneration efficiency of a series of side-chain carbazole homopolymers and copolymers (with azo side-chains) have been investigated. Cyclic voltammetry measurement of frontier orbitals energies show that the HOMO energy is determined by the nature and the position of attachment of the linker between the main chain and the carbazole, the azo-moiety being not relevant in this respect. Hole mobility is not influenced by the HOMO energy but seems to depend on the degree of conformational mobility of the side-chains, reaching values of the order of 10-3cm2V-1s-1 in the best cases. The HOMO energy is instead extremely important when considering photogeneration efficiency, that can change by 10 orders of magnitude depending on the density of the carbazole side-chains in co-polymers and on the linker nature and attachment position. © 2011 Elsevier B.V. All rights reserved.

Citation

Li, H., Termine, R., Godbert, N., Angiolini, L., Giorgini, L., & Golemme, A. (2011). Charge photogeneration and transport in side-chain carbazole polymers and co-polymers. Organic Electronics, 12(7), 1184–1191. doi:10.1016/j.orgel.2011.03.043