The EURAMET.PR-S5 intercomparison of the short circuit current of reference solar cells at standard test conditions was carried out as star type comparison. In total 6 participants with seven facilities took part, 1 from Europe (PTB/Germany with two facilities: the established DSR facility as pilot lab and the new Laser-DSR facility as participant) and 5 outside Europe (NIM/China, VNIIOFI/Russia, KRISS/South Korea, A-STAR/Singapore, ITRI/Chinese Taipei). Therefore, this comparison can be considered as a worldwide one as all NMIs world-wide that had built up facilities for the primary ISTC-calibration of reference solar cells when the measurements started, participated.

For the calculation of the reference value of the supplementary comparison no participant had to be excluded and the used weighted mean with cut-off has been supported by all participants.

The unilateral Degrees of Equivalence (DoE) calculated for each participant are fully 100 % consistent with their standard uncertainties. The largest En-value is 0.61 and therefore significant smaller than 1. The chi-square test is fully satisfied with 2.09 < χ²(5) = 11.07. Thus, the DSR method is highly suitable for the calibration of reference solar cells according to the short circuit current at standard test conditions.

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The final report has been peer-reviewed and approved for publication by the CCPR, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).