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Photovoltaic characterization of concentrator solar cells by localized irradiation
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10.1063/1.2266161
/content/aip/journal/jap/100/4/10.1063/1.2266161
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/4/10.1063/1.2266161
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Minidish solar concentrator ( in diameter). The sun is imaged into the upward-facing tip of an optical fiber, which guides concentrated sunlight to an indoor laboratory where solar cell curves are measured. Input power is moderated by a pizza-slice iris that preserves the angular distribution of delivered sunlight. (b) Uniform cell irradiation via a kaleidoscope. (c) Fiber-cell contact in the LI mode.

Image of FIG. 2.
FIG. 2.

Solar cells studied. (a) Square with a uniform grid. The inset magnifies the uniform metallization. (b) Square with a nonuniform grid.

Image of FIG. 3.
FIG. 3.

(Color online) FF for the uniform grid cell measured under uniform irradiation and with LI at the seven indicated locations, with an experimental uncertainty in FF of 4% (relative).

Image of FIG. 4.
FIG. 4.

(Color online) Dependence of and on for uniform and localized irradiation. The experimental uncertainties are 1% for and 5% (relative) for .

Image of FIG. 5.
FIG. 5.

(Color online) Representative curves of the uniform grid cell measured under (a) uniform and (b) localized irradiation. The experimental uncertainty in both and is 1%.

Image of FIG. 6.
FIG. 6.

(Color online) (a) measured at central, intermediate, and corner locations. The inset illustrates locations of the LI spot on the cell surface. Data for points 4 and 5 are not shown because they coincide with those for points 2 and 1, respectively, which reflects the central symmetry. (b) Representative curves from LI tests at central and corner locations of the nonuniform grid cell. Data for points 4 and 5 are not shown because they coincide with those for points 2 and 1, respectively, which reflects the central symmetry.

Image of FIG. 7.
FIG. 7.

(Color online) Dependence of FF, , and on and LI location for the nonuniform grid cell [locations are identified in Fig. 6(a)].

Image of FIG. 8.
FIG. 8.

(Color online) (a) Schematic illustration of how the current-voltage curves of the dark and illuminated regions of a cell under LI combine to yield the measured curve. and denote the respective open-circuit voltages of the entire cell and the localized illuminated spot. (b) Sample calculated current-voltage curves for the illuminated region and the entire cell, at varying with and .

Image of FIG. 9.
FIG. 9.

(Color online) Calculated vs , illustrating sensitivity to under localized irradiation.

Image of FIG. 10.
FIG. 10.

(Color online) Calculated FF as a function of for LI, illustrating sensitivity to .

Image of FIG. 11.
FIG. 11.

(Color online) Calculated as a function of , illustrating sensitivity to and .

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/content/aip/journal/jap/100/4/10.1063/1.2266161
2006-08-31
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photovoltaic characterization of concentrator solar cells by localized irradiation
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/4/10.1063/1.2266161
10.1063/1.2266161
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