EXTRACTION OF THE DIFFUSION LENGTH OF SOLAR CELLS FROM THE SPECTRAL RESPONSE OF THE OPEN-CIRCUIT VOLTAGE

摘要

The diffusion length of a solar cell can be determined from a large signal measurement of the spectral response of the open-circuit voltage. This new method is demonstrated with solar cells fabricated on aluminiumdoped p-silicon. The relatively low carrier lifetime of this particular material ensures that the diffusion length can be unambiguously extracted by a straightforward linear fit of the inverse internal quantum efficiency versus the absorption length. The method is compared to the determination of the diffusion length from the spectral response of the short-circuit current. An excellent agreement between both techniques has been found.