Effects of O2, Xe, and Gating on the Photoconductivity and Persistent Photoconductivity of Porphyrin Nanorods

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• 作者：C. Kent Riley ; Eric A. Muller ; Benjamin E. Feldman ; Colin M. Cross ; Katherine L. Van Aken ; Danvers E. Johnston ; Ye Lu ; A. T. Johnson ; Julio C. de Paula ; W. F. Smith
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：November 18, 2010
• 年：2010
• 卷：114
• 期：45
• 页码：19227-19233
• 全文大小：311K
• 年卷期：v.114,no.45(November 18, 2010)
• ISSN：1932-7455

文摘

The photoconductivity of samples including both individual nanorods and bundles self-assembled from meso-tetra(4-sulfonato-phenyl)porphine grows over several days of illumination by more than a factor of 15. It also shows a transition from an initially nonpersistent response (in which the conductivity goes to zero when illumination is removed) to a primarily persistent response (in which the conductivity decays slowly when illumination is removed). Application of a gate voltage results in an initial n-type response, most of which decays away slowly, even though the gate voltage is held constant. The addition of O₂ to the inert atmosphere surrounding the samples drastically reduces the persistent photoconductivity. When Xe is used instead of O₂, there is at most a slight reduction of conductivity. A qualitative model is presented, in which the conductivity changes are attributed to light-induced and gate-voltage-induced adsorption and desorption of O₂.