Charge carrier mobility and lifetime versus composition of conjugated polymer/fullerene bulk-heterojunction solar cells

✍ Scribed by G. Dennler; A.J. Mozer; G. Juška; A. Pivrikas; R. Österbacka; A. Fuchsbauer; N.S. Sariciftci

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 315 KB
• Volume: 7
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2006.02.004

✦ Synopsis

Charge carrier mobility (l), recombination kinetics, and lifetime (s) have been investigated with the photo-induced charge carrier extraction by linearly increasing voltage technique (photo-CELIV) in blends of poly[2-methoxy-5-(3,7-dimethyloctyloxy)-phenylene vinylene] (MDMO-PPV) and 1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)-C 61 (PCBM). Different MDMO-PPV/PCBM ratios have been studied showing that increasing the PCBM content induces an increase of the photo-CELIV mobility up to two orders of magnitude. Simultaneously, the lifetime of the charge carriers decreases in such a way that the product l • s appears almost constant independently of the blend composition. Recombination kinetics close to the Langevin one is observed for all PCBM concentrations studied.