Electron and Hole Contributions to the Terahertz Photoconductivity of a Conjugated Polymer:Fullerene Blend Identified
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- 作者：Carlito S. Ponseca ; Jr. ; Hynek N臎mec ; Nenad Vukmirovi膰 ; Sandra Fusco ; Ergang Wang ; Mats R. Andersson ; Pavel Chabera ; Arkady Yartsev ; Villy Sundstr枚m
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：September 6, 2012
- 年：2012
- 卷：3
- 期：17
- 页码：2442-2446
- 全文大小：328K
- 年卷期：v.3,no.17(September 6, 2012)
- ISSN：1948-7185
文摘
Time-resolved terahertz spectroscopy was employed for the investigation of charge-transport dynamics in benzothiadiazolo-dithiophene polyfluorene ([2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4鈥?7鈥?di-2-thienyl-2鈥?1鈥?3鈥?benzothiadiazole)]) (APFO-3) polymers with various chain lengths and in its monomer form, all blended with an electron acceptor ([6,6]-phenyl-C61-butyric acid methyl ester, PCBM). Upon photoexcitation, charged polaron pairs are created, negative charges are transferred to fullerenes, while positive polarons remain on polymers/monomers. Vastly different hole mobility in polymer and monomer blends allows us to distinguish the hole and electron contributions to the carrier mobility.