Photoexcitation Dynamics of Coupled Semiconducting Carbon Nanotube Thin Films

被引:41
作者
Mehlenbacher, Randy D. [1 ]
Wu, Meng-Yin [3 ]
Grechko, Maksim [1 ]
Laaser, Jennifer E. [1 ]
Arnold, Michael S. [2 ]
Zanni, Martin T. [1 ]
机构
[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
[2] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA
[3] Univ Wisconsin, Dept Elect & Comp Engn, Madison, WI 53706 USA
基金
美国国家科学基金会;
关键词
Carbon nanotube; exciton; transient absorption; anisotropy; photovoltaic; EXCITON ENERGY-TRANSFER; SELECTIVE DISPERSION; NANOCRYSTALS; PHOTOLUMINESCENCE; SPECTROSCOPY; GENERATION; ARRAYS;
D O I
10.1021/nl304591w
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Carbon nanotubes are a promising means of capturing photons for use in solar cell devices. We time-resolved the photoexcitation dynamics of coupled, bandgap-selected, semiconducting carbon nanotubes in thin films tailored for photovoltaics. Using transient absorption spectroscopy and anisotropy measurements, we found that the photoexcitation evolves by two mechanisms with a fast and long-range component followed by a slow and short-range component. Within 300 fs of optical excitation, 20% of nanotubes transfer their photoexcitation over 5-10 nm into nearby nanotube fibers. After 3 ps, 70% of the photoexcitation resides on the smallest bandgap nanotubes. After this ultrafast process, the photoexcitation continues to transfer on a similar to 10 ps time scale but to predominantly aligned tubes. Ultimately the photoexcitation hops twice on average between fibers. These results are important for understanding the flow of energy and charge in coupled nanotube materials and light-harvesting devices.
引用
收藏
页码:1495 / 1501
页数:7
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