Ultrafast Charge Separation at a Polymer-Single-Walled Carbon Nanotube Molecular Junction
Ultrafast Charge Separation at a Polymer-Single-Walled Carbon Nanotube Molecular Junction
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DOI：
10.1021/nl1036484
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发表时间：
2011-01-01
期刊：
影响因子：
10.8
通讯作者：
Nicholas, Robin J.
中科院分区：
文献类型：
--
作者：
Stranks, Samuel D.;Weisspfennig, Christian;Nicholas, Robin J.
我们用飞秒光谱技术研究了单壁碳纳米管(SWNTs)与聚(3-己基噻吩基)(P3HT)界面上的电荷光生动力学。我们证明了P3HT的光激发在单壁碳纳米管周围形成一个单分子层导致材料之间的超快(类似于430飞秒)电荷转移。过量的P3HT的加入导致了长期的电荷分离，其中自由极化子在室温下保持分离。我们的结果表明，只要将小直径的管子分别嵌入到P3HT基质中，只含有少量(1%)的SWNT-P3HT共混物可以实现光子到电荷的转换，其效率与传统的(60：40)P3HT-富勒烯共混物相当。
We have investigated the charge photogeneration dynamics at the interface formed between single-walled carbon nanotubes (SWNTs) and poly(3-hexylthiophene) (P3HT) using a combination of femtosecond spectroscopic techniques. We demonstrate that photoexcitation of P3HT forming a single molecular layer around a SWNT leads to an ultrafast (similar to 430 fs) charge transfer between the materials. The addition of excess P3HT leads to long-term charge separation in which free polarons remain separated at room temperature. Our results suggest that SWNT-P3HT blends incorporating only small fractions (1 %) of SWNTs allow photon-to-charge conversion with efficiencies comparable to those for conventional (60:40) P3HT-fullerene blends, provided that small-diameter tubes are individually embedded in the P3HT matrix.