Intercomparison campaign of spectroradiometers for a correct estimation of solar spectral irradiance: Results and potential impact on photovoltaic devices calibration

Roberto Galleano, Willem Zaaiman, Alessandro Virtuani, Diego Pavanello, Paolo Morabito, Alessandro Minuto, Angelo Spena, Simona Bartocci, Raffaele Fucci, Gianni Leanza, Daniela Fasanaro, Mario Catena

Research output: Contribution to journalArticle

12 Citations (Scopus)


This paper describes the results of an intercomparison of spectroradiometers for global and direct normal incidence irradiance in the visible and near-infrared spectral regions together with an assessment of the impact these results may have on the estimation of the short-circuit current (ISC) calibration of photovoltaic devices and on the spectral mismatch calculation. The intercomparison was conducted in the framework of the European project Apollon with the additional participation of external partners from the Italian project for the long-term monitoring of solar radiation for photovoltaics. Six institutions and six spectroradiometer systems, representing different technologies and manufacturers, were involved. Prior to the intercomparison, all participating partners calibrated their own instrument(s) according to their usual procedures in order to verify the entire measuring and traceability chain. The difference in measured spectra shape and amplitude showed to have an impact on ISC calculation of less than 3% and less than 6% for single-junction and multi-junction devices, respectively. When only the shape of the spectra is considered, the spectral mismatch ranges from 1.7% to 4.7% depending on the spectral response of the device.
Original languageEnglish
Pages (from-to)1128 - 1137
Number of pages10
JournalProgress in Photovoltaics: Research and Applications
Issue number11
Publication statusPublished - 1 Nov 2014


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this