(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.
Solar cells studied. (a) Square with a uniform grid. The inset magnifies the uniform metallization. (b) Square with a nonuniform grid.
(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).
(Color online) Dependence of and on for uniform and localized irradiation. The experimental uncertainties are 1% for and 5% (relative) for .
(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%.
(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.
(Color online) Dependence of FF, , and on and LI location for the nonuniform grid cell [locations are identified in Fig. 6(a)].
(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 .
(Color online) Calculated vs , illustrating sensitivity to under localized irradiation.
(Color online) Calculated FF as a function of for LI, illustrating sensitivity to .
(Color online) Calculated as a function of , illustrating sensitivity to and .
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