Photoconductivity of self-assembled porphyrin nanorods

被引:242
作者
Schwab, AD
Smith, DE
Bond-Watts, B
Johnston, DE
Hone, J
Johnson, AT
de Paula, JC
Smith, WF [1 ]
机构
[1] Haverford Coll, Dept Chem, Haverford, PA 19041 USA
[2] Haverford Coll, Dept Phys, Haverford, PA 19041 USA
[3] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA
[4] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
关键词
D O I
10.1021/nl049421v
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The photoconductivity of nanorods self-assembled from meso-tetrakis(4-sulfonatophenyl)porphine is described. The nanorods are insulating in the dark. Upon illumination with 488 nm light, the nanorods become photoconductive, exhibiting a rapid turn on/off ( < 100 ms) of the current when the light is turned on/off. This photoconductivity grows over hundreds of seconds with light exposure and decays slowly when the light is off. The nanorods can be trained via an applied bias to exhibit a short-circuit photocurrent (with corresponding open-circuit photovoltage) that flows in the direction opposite that of the training bias. A qualitative model is proposed, in which conduction occurs through the tightly coupled LUMOs of close-packed porphyrin molecules.
引用
收藏
页码:1261 / 1265
页数:5
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