Charge Carrier Dynamics in Alternating Polyfluorene Copolymer:Fullerene Blends Probed by Terahertz Spectroscopy

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• 作者：Hynek Nmec ; Han-Kwang Nienhuys ; Fengling Zhang ; Olle Ingan&auml ; s ; Arkady Yartsev ; Villy Sundströ ; m
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 24, 2008
• 年：2008
• 卷：112
• 期：16
• 页码：6558 - 6563
• 全文大小：104K
• 年卷期：v.112,no.16(April 24, 2008)
• ISSN：1932-7455

文摘

Time-resolved terahertz spectroscopy is used for investigation of photoinduced charge carrier dynamics inblends of a polyfluorene copolymer (poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl -2',1',3-benzo-thiadiazole)]) and an electron acceptor ([6,6]-phenyl-C₆₁-butyric acid methyl ester). The transient far-infraredresponse appears instantaneously after photoexcitation. We show that the transient conductivity spectrum isdominated by two major contributions: response of separated charge carriers and response of coupled polaronpairs.