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Solution Processable n-Type Perylene Diimide Copolymers for Organic Photovoltaics

Published online by Cambridge University Press:  02 February 2011

Ziqi Liang ,
Russell A. Cormier ,
Alexandre M. Nardes  and
Brian A. Gregg
Ziqi Liang
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401ziqi.liang@nrel.gov; brian.gregg@nrel.gov
Russell A. Cormier
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401ziqi.liang@nrel.gov; brian.gregg@nrel.gov
Alexandre M. Nardes
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401ziqi.liang@nrel.gov; brian.gregg@nrel.gov
Brian A. Gregg
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401ziqi.liang@nrel.gov; brian.gregg@nrel.gov
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Abstract

Perylene diimides are known as promising n-type semiconductor building blocks. Here we report the synthesis and characterization of a set of three soluble poly(perylene diimide)s and their preliminary characterization in organic photovoltaic cells. These polymers are made through the polycondensation of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) with a variety of poly(ethylene glycol) (PEG)- or poly(propylene glycol) (PPG)-based diamine comonomers. The flexible spacer offers increased solubility in organic solvents and allows the perylene core to assume a conformation that promotes favorable cofacial π–π interactions. Mixtures of these polymers with the hole-transporting polymer, poly(3-hexylthiophene) (P3HT) result in significant fluorescence quenching. However, the phase separation occurs on a scale too large for a bulk heterojunction solar cell. The PPGylated poly(perylene diimide) shows an unusually low free electron concentration (~1.0 × 1012 cm-3) and therefore makes an excellent model system for future doping studies. These new polymers may have promise as stable electron-conductive layers with large light-absorptivities in solution-processable applications of organic electronics.

Keywords

liquid crystalphotovoltaicpolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e08-58
Copyright
Copyright © Materials Research Society 2011

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