Conjugated polymers with polar side chains in bulk heterojunction solar cell devices
Artikel i vetenskaplig tidskrift, 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

Författare

Desta Antenehe Gedefaw

Chalmers, Kemi- och bioteknik, Polymerteknologi

Y. Zhou

Linköpings universitet

Soochow University

Z. F. Ma

Linköpings universitet

Z. Genene

Addis Ababa University

Stefan Hellström

Chalmers, Kemi- och bioteknik, Polymerteknologi

Fengling Zhang

Linköpings universitet

Wendimagegn Mammo

Addis Ababa University

Olle Inganäs

Linköpings universitet

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Polymer International

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

Vol. 63 1 22-30

Ämneskategorier

Textil-, gummi- och polymermaterial

DOI

10.1002/pi.4600