Calculation of Spectral Mismatch

14 February 2019

A reference cell is often used to determine the irradiance of the solar simulator used. Where the spectral response of the reference cell differs from the test cell, the mismatch factor should be computed from:-

Where Sr(λ) is the reference device spectral response, St(λ) the test device spectral response, E0(λ) the AM1.5 reference spectral distribution, and E(λ) the solar simulator spectral distribution.

Since these parameters appear in both numerator and denominator, normalised quantities may be used.

Where required, the irradiance of the solar simulator should be set to:-

Where Gref is the reference irradiance of 1000 W.m-2.

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Category: Solar & Photovoltaics