Abstract
Abstract Modifications to the IR photocurrent (IRPC) instrument, used for mapping the diffusion length of minority carriers in the bulk of edge-defined film-fed growth (EFG) solar cells, have resulted in a substantial improvement it its performance. Due to the correction of certain design weaknesses in the existing apparatus it is now possible to make reproducible measurements of the diffusion length on a greater assortment of solar cells. The modifications that have been made include the following: (i) an improved design of the fiber optic bundle that makes possible substantially better collection of reflected light; (ii) the inclusion of a current amplifier in the measurement of the short-circuit current, making possible the measurement of cells with higher reverse leakage currents; (iii) the inclusion of a reference strip of single-crystal cell with known diffusion length that aids in the calibration of the light source. With these modifications, and the improved operating procedures that have been developed, the IRPC instrument should prove useful in ongoing efforts to enhance solar cell efficiencies.
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