Bajpai, Manisha and Srivastava, Ritu and Dhar, Ravindra and Tiwari, R. S. (2016) Role of reduced pi-pi stacking in the charge transport in polyfluorene. Materials Science and Engineering: B, 212. pp. 62-70. ISSN 0921-5107

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Abstract

We investigated the effect of blending of a bulky copolymer on the hole transport properties of poly (9,9-dihexyl fluorenyl-2,7-diyl)(PFO) thin films (similar to 120 nm) at different temperatures by obtaining the current density-voltage measurement. The poly (phenylenevinylene) based copolymer "Super Yellow" (SY) has been used as a blending component. Such polymer blending matrix is useful as it combines the host polymer (PFO) with the guest polymer of bulky side groups where pi-pi stacking is hindered by bulky side groups. This makes polyflorene much interesting and versatile material for lighting application. It has been found that the current density decreases on blending for a given applied bias. We demonstrated that the current conduction mechanism is bulk limited. It has been analyzed by trapped charge limited currents (TCLC) with electric field. We conclude that the relatively low hole mobility in blends as compared to pristine PFO would result due to increase in the pi-pi stacking distance and disorder.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords:	Conducting polymers Hole transport pi-pi stacking Charge transport parameters
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	17 Apr 2018 12:04
Last Modified:	17 Apr 2018 12:04
URI:	http://npl.csircentral.net/id/eprint/2347

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