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Efficient Schottky-quantum-dot photovoltaics: The roles of depletion, drift, and diffusion
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10.1063/1.2896295
/content/aip/journal/apl/92/12/10.1063/1.2896295
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/12/10.1063/1.2896295
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Figures

Image of FIG. 1.
FIG. 1.

The energy band model, showing the presence of a Schottky barrier and bending in the conduction band , valence band , and vacuum energy level near the Al/nanocrystal interface. The built-in electric field within the depletion region of the nanocrystal layer governs the transport of photogenerated electrons and holes . The Fermi level is drawn to show the -type conduction characteristics. The bandgap of these nanocrystals is , defined as the first absorption peak energy.

Image of FIG. 2.
FIG. 2.

Representative current transient signals used to extract (a) the hole mobility (CELIV, under ramp rate) and (b) the electron mobility (time-of-flight, under bias). The inset shows the bias dependence of the transit time . The slope of the data above was used to determine the mobility. The dashed red lines represent in (a) the different current density levels and in (b) the least-squares fits to the data.

Image of FIG. 3.
FIG. 3.

(a) Representative decay signal (after , illumination turn off) and a linear best fit (dashed red line) used to determine the recombination-limited lifetime. (b) Lifetime (blue crosses, left axis) and EQE (red circles, right axis) and as a function of illumination intensity at . A knee can be seen in the EQE plot at , which corresponds to the intensity at which the minority carrier transit time exceeds the lifetime. The scatter in the data at low intensities is due to larger measurement uncertainty.

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/content/aip/journal/apl/92/12/10.1063/1.2896295
2008-03-27
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficient Schottky-quantum-dot photovoltaics: The roles of depletion, drift, and diffusion
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/12/10.1063/1.2896295
10.1063/1.2896295
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