Conjugated polymers with polar side chains in bulk heterojunction solar cell devices
Journal article, 2014

Two polymers with polar side chains, namely poly[2,7-(9,9-dioctylfluorene)-alt-5,5-(5',8'-di-2-thienyl-(2',3'-bis(3''-(2-(2-methoxyethoxy)ethoxy)phenyl)quinoxaline))] (P1) and poly[2,7-(9,9-bis(2-(2-methoxyethoxy)ethyl)fluorene)-alt-5,5-(5',8'-di-2-thienyl-(2',3'-bis(3''-(2-(2-methoxyethoxy)-ethoxy)phenyl)quinoxaline))] (P2), were synthesized for solar cell application. A series of bulk heterojunction solar cells were systematically fabricated and characterized by varying the electron-acceptor materials, processing solvents and thickness of the active layer. The results show that P1, with a higher molecular weight and good film-forming properties, performed better. The best device showed an open circuit voltage of 0.87 V, a short circuit current of 6.81 mA cm(-2) and a power conversion efficiency of 2.74% with 1:4 polymer:[6,6]-phenyl-C71-butyric acid methyl ester (PCBM[70]) mixture using o-dichlorobenzene (o-DCB) as processing solvent. P2 on the other hand showed a poorer performance with chlorobenzene as processing solvent, but a much improved performance was obtained using o-DCB instead. Thus, an open circuit voltage of 0.80 V, short circuit current of 6.21 mA cm(-2) and an overall power conversion efficiency of 2.22% were recorded for a polymer:PCBM[70] mixing ratio of 1:4. This is presumably due to the improvement of the morphology of the active layer using o-DCB as processing solvent. (c) 2013 Society of Chemical Industry

TANDEM

POLYFLUORENE COPOLYMER

polar polymer

power conversion efficiency

ENHANCEMENT

ELECTRON

BLENDS

MORPHOLOGY

LOW-BANDGAP POLYMER

ORGANIZATION

conjugated polymer

PERFORMANCE

donor-acceptor-donor

Author

Desta Antenehe Gedefaw

Chalmers, Chemical and Biological Engineering, Polymer Technology

Y. Zhou

Linköping University

Soochow University

Z. F. Ma

Linköping University

Z. Genene

Addis Ababa University

Stefan Hellström

Chalmers, Chemical and Biological Engineering, Polymer Technology

Fengling Zhang

Linköping University

Wendimagegn Mammo

Addis Ababa University

Olle Inganäs

Linköping University

Mats Andersson

Chalmers, Chemical and Biological Engineering, Polymer Technology

Polymer International

0959-8103 (ISSN) 1097-0126 (eISSN)

Vol. 63 1 22-30

Subject Categories

Textile, Rubber and Polymeric Materials

DOI

10.1002/pi.4600

More information

Latest update

2/28/2018