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Understanding tandem organic photovoltaic cell performance
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10.1063/1.4807910
/content/aip/journal/jap/113/21/10.1063/1.4807910
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4807910

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of a tandem cell incorporating sub-cells stacked in series. Incident photons are absorbed, generating excitons that are subsequently dissociated into free carriers. Holes (open circles) in the first sub-cell are collected at the anode, while electrons (closed circles) in the th sub-cell are collected at the cathode. All other carriers recombine with opposite charges at the transparent recombination layers between the sub-cells.

Image of FIG. 2.
FIG. 2.

(a) Dark and (b) illuminated current-voltage characteristics for single-cell devices used in this work. Experimental data are represented by symbols, while the fits are represented by solid lines. Parameters used in these fits are found in Table II .

Image of FIG. 3.
FIG. 3.

Contour plots of simulated device performance characteristics of tandem using cell as sub-cell 1 and cell as sub-cell 2. The short-circuit current () of each sub-cell is varied by changing the exciton flux at the heterojunction (). The squares, triangles and circles denote data points corresponding to example devices used in Fig. 4 .

Image of FIG. 4.
FIG. 4.

Current-voltage () characteristics of three example tandem devices (solid line), indicated by symbols in Fig. 3 , each with the constituent sub-cell characteristics shown by dashed lines. The MPP is represented by a circle on each line. The vertical dashed line is at = 0, and the horizontal dotted line marks the current at which the sub-cells are operating when the tandem is at its MPP.

Image of FIG. 5.
FIG. 5.

Contour plots of simulated performance characteristics of tandem using cell as sub-cell 1 and cell as sub-cell 2. The for each sub-cell is determined by varying . The squares, triangles and circles denote data points corresponding to example devices used in Fig. 6 .

Image of FIG. 6.
FIG. 6.

The characteristics of three example tandem devices indicated by symbols in Fig. 5 . Tandem cells are indicated by the solid lines, and the sub-cells by dashed lines. The MPP is represented by a circle on each line. The vertical dashed line is at  = 0, and the horizontal dotted line marks the current at which the sub-cells are operating when the tandem is at MPP.

Tables

Generic image for table
Table I.

Device structures and performance parameters for archetype single-cell devices.

Generic image for table
Table II.

Fitting parameters from archetype single-cell devices in Table I .

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/content/aip/journal/jap/113/21/10.1063/1.4807910
2013-06-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Understanding tandem organic photovoltaic cell performance
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4807910
10.1063/1.4807910
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