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Issue 7, 2011
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Spatially resolved photoconductivity of thin films formed by colloidal octapod-shaped CdSe/CdS nanocrystals

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Abstract

We studied the optical absorption and photoconductive properties of thin films consisting of core–shell octapod-shaped nanocrystals, which consisted of CdS pods that branch out from a CdSe core. The current–voltage characteristics were measured at room and cryogenic temperatures and agreed well with a phenomenological exponential fitting model, from which we could extract the sheet resistance and the average voltage barrier for the charge tunneling between the octapods. The temperature dependence of the photocurrent showed temperature activated behavior above 220 K and a non-Arrhenius exponential (T/T0)n dispersion below 220 K. Furthermore, we mapped the photocurrent generation within the octapod film viascanning photocurrent microscopy, which revealed photocurrent enhancement near micron-size voids and spatial shifts of the photocurrent maxima with bias voltage.

Graphical abstract: Spatially resolved photoconductivity of thin films formed by colloidal octapod-shaped CdSe/CdS nanocrystals

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Publication details

The article was received on 08 Mar 2011, accepted on 21 Apr 2011 and first published on 03 Jun 2011


Article type: Paper
DOI: 10.1039/C1NR10251F
Citation: Nanoscale, 2011,3, 2964-2970

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    Spatially resolved photoconductivity of thin films formed by colloidal octapod-shaped CdSe/CdS nanocrystals

    Y. Zhang, K. Miszta, S. Kudera, L. Manna, E. Di Fabrizio and R. Krahne, Nanoscale, 2011, 3, 2964
    DOI: 10.1039/C1NR10251F

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