Effect of Acceptor Lamination on Photocarrier Dynamics in Hole Transporting Hexabenzocoronene Nanotubular Self-Assembly
Effect of Acceptor Lamination on Photocarrier Dynamics in Hole Transporting Hexabenzocoronene Nanotubular Self-Assembly
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受主层压对空穴传输六苯并苯纳米管自组装光载流子动力学的影响
DOI：
10.1021/jp402640k
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发表时间：
2013
影响因子：
3.7
通讯作者：
K. Akiyama
中科院分区：
文献类型：
--
作者：
Y. Wakikata;T. Ikoma;Y. Yamamoto;T. Fukushima;T. Aida;K. Akiyama
利用外加磁场下的瞬时光导测量研究了低维六苯并冠烯(HBC)自组装中的光载流子动力学，并阐明了HBC纳米管表面电子受体层的层叠效应。在没有受主的HBC柱中，双子电子-空穴(e-h)对的载流子产额依赖于外部电场和磁场。分析了磁场效应对HBC柱结构中双态e-h对动力学的时间依赖性，估算了单态和三态e-h对的复合速率常数(KrSandkrT)，分别为1.5×108和1.2×108s-1。同样的动力学分析考虑了电场对光载流子产生产率的影响，在HBC柱结构中得到了在107-108s-1范围内与电场有关的离解速率常数。然而，电场和磁场对受主掺杂的HbC纳米管的载流子产生过程都没有观察到影响。外场效应的消失表明，由于一些σ键的存在，有序的施主/受主异质结(间隔几纳米)大大减少了双态复合。然而，高载流子密度材料固有的入射光子密度和磁场效应也解释了受主掺杂的HBc纳米管中KrS：Krt=1.0：0.8的高效非线型复合。
Measurements of transient photoconductance under an external magnetic field were used to investigate photocarrier dynamics in low-dimensional hexabenzocoronene (HBC) self-assemblies, which are a promising material group for highly efficient solar cells achieved by bottom-up technology, and to clarify the effect of lamination with electron acceptor layer on the surfaces of HBC nanotubes. In an HBC column without an acceptor, the carrier generation yield from a geminate electron–hole (e-h) pair is dependent on the external electric and magnetic fields. The time dependence of the magnetic field effect on geminate e-h pair dynamics in the HBC column structure was analyzed to estimate the recombination rate constants of the singlet and triplet e-h pairs (krSandkrT), which were 1.5 × 108and 1.2 × 108s–1respectively. The same kinetic analysis with consideration of the electric field effect on the photocarrier generation yield provided an electric field dependent dissociation rate constant in the range of 107–108s–1in the HBC column structure. However, neither electric nor magnetic field effects on the carrier generation process were observed in acceptor-appended HBC nanotubes. The disappearance of the external field effects in acceptor-appended HBC indicates that the geminate recombination is reduced substantially by a well-organized donor/acceptor heterojunction with an interval of a few nanometers due to some σ-bonds. However, efficient nongeminate recombination with a ratio ofkrS:krT= 1.0:0.8 in the acceptor-appended HBC nanotubes was also elucidated by the incident photon density and magnetic field effects, which is an inherent nature in materials with high carrier density.
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影响因子：
29.4
作者：
Y. Yamamoto;T. Fukushima;W. Jin;A. Kosaka;T. Hara;T. Nakamura;A. Saeki;S. Seki;S. Tagawa;T. Aida
通讯作者：
Y. Yamamoto;T. Fukushima;W. Jin;A. Kosaka;T. Hara;T. Nakamura;A. Saeki;S. Seki;S. Tagawa;T. Aida
可能的一维螺旋导体：六邻六苯并苯纳米管，
DOI：
--
发表时间：
2008
期刊：
J. Phys. Soc. Jpn 77
影响因子：
--
作者：
T. Hara;K. Furukawa;T. Nakamura;Y. Yamamoto;A. Kosaka;W. Jin;T. Fukushima and T. Aida
通讯作者：
T. Fukushima and T. Aida
具有叠加能量和位置无序的分子掺杂聚合物中的分散和非分散电荷传输。
DOI：
10.1103/physrevb.47.4289
发表时间：
1993
期刊：
Physical review. B, Condensed matter
影响因子：
--
作者：
Borsenberger;Richert;Baessler
通讯作者：
Baessler
盘状六苯并酮中载流子的迁移率和衰变动力学
影响因子：
19
作者：
J. Piris;M. Debije;M. Watson;K. Müllen;J. Warman
通讯作者：
J. Warman
影响因子：
8.6
作者：
Arkhipov, VI;Emelianova, EV;Bässler, H
通讯作者：
Bässler, H