Controlling molecular weight of a high efficiency donor-acceptor conjugated polymer and understanding its significant impact on photovoltaic properties

Wentao Li; Liqiang Yang; John R Tumbleston; Liang Yan; Harald Ade; Wei You

doi:10.1002/adma.201305251

Controlling molecular weight of a high efficiency donor-acceptor conjugated polymer and understanding its significant impact on photovoltaic properties

Adv Mater. 2014 Jul 9;26(26):4456-62. doi: 10.1002/adma.201305251. Epub 2014 Mar 14.

Authors

Wentao Li¹, Liqiang Yang, John R Tumbleston, Liang Yan, Harald Ade, Wei You

Affiliation

¹ Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599-3290, USA.

PMID: 24634368
DOI: 10.1002/adma.201305251

Abstract

The molecular weight (MW) of PBnDT-FTAZ can be precisely controlled by adjusting the stoichiometric ratio of the two monomers, following the Carothers equation. The study of a set of PBnDT-FTAZ polymers with different MWs reveals that the MW significantly influences the morphology and structural order of PBnDTFTAZ in its bulk heterojunction solar cells, with the highest efficiency (over 7%) achieved with the use of a MW of 40 000 g mol(-1) .

Keywords: GIWAXS; R-SoSX; miscibility; mixed domains; molecular weight; polymer solar cells; soft X-ray scattering.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.