The use of size-selective excitation to study photocurrent through junctions containing single-size and multi-size arrays of colloidal CdSe quantum dots

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作者：
Weiss, Emily A. [1 ]
Porter, Venda J. [2 ]
Chiechi, Ryan C. [1 ]
Geyer, Scott M. [2 ]
Bell, David C. [3 ]
Bawendi, Moungi G. [2 ]
Whitesides, George M. [1 ]
机构：
[1] Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, United States
[2] Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
[3] Center for Nanoscale Systems, Harvard University, LISE 306, 11 Oxford Street, Cambridge, MA 02138, United States
来源：
Journal of the American Chemical Society | 2008年 / 130卷 / 01期
关键词：
This paper describes a study of the generation and flow of photocurrent through junctions containing three-dimensional arrays of colloidal CdSe quantum dots (QDs) of either a single size or multiple sizes. The electrodes were indium tin oxide (ITO) covered with a thin layer of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and a eutectic alloy of Ga and In (EGaIn). We measured the current-voltage characteristics of the junctions in the dark and under illumination, with various sources and wavelengths of excitation, and their photocurrent action spectra. Size-selective photoexcitation of the arrays of multiple sizes of QDs helped to determine (i) the location of the interface at which photoinduced separation of charge occurred, (ii) whether the energy absorbed by the QDs was redistributed before separation of charge, and (iii) the dependence of the photovoltage on the locations of various sizes of QDs within the junction. This research is a step toward the use of QDs for harvesting light and for transporting energy and charge in devices - for example, solar cells and photodetectors - that operate at zero bias. © 2008 American Chemical Society;
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页码：83 / 92
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    Geyer, Scott M.
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