1. The spectral response is the ratio of the current generated by the solar cell to the power incident on the solar cell. With measuring the spectral response of a solar cell its quantum efficiency can be determined.
2. The fraction of available irradiance that is converted into current is called spectral response. Its Unit is A/W. The spectral response is a function of wavelength.
optical characterization of solar cells
http://www.pveducation.org/pvcdrom/solar-cell-operation/spectral-response (1.); https://pvpmc.sandia.gov/modeling-steps/2-dc-module-iv/effective-irradiance/spectral-response/ (2.)
Author: Svenja Gutt