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(a) Minidish dual-axis tracking solar concentrator (20 cm in diameter). Solar radiation is concentrated outdoors into the tip of a highly transmitting optical fiber which guides the concentrated sunlight indoors onto the solar cell being tested. (b) Uniform cell irradiation via a kaleidoscope. (c) The layer sequence of the inverted P3HT:PCBM BHJ cell (through-glass illumination). The solar cell area is defined as the overlap between the ITO and the Ag electrodes.
Effect of sunlight concentration on (a), (b) , (c) and [inset in (c)] of BHJ cell. Insets in (a) and (b) show the linear dependence of on and the linear correlation between and , respectively.
curves measured before and after 3 hours of light exposure (LE) at: various and temperature.
Fitting parameters for four studied solar cells. and are the fitting parameters describing a power law relation between and [Eq. (3)]. is the diode ideality factor calculated by evaluating the semilogarithmic fit of the data according to Eq. (2). , , and were calculated for .
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