A Comparison of Si-Based Cameras for Imaging Luminescence from Photovoltaic Materials and Devices

Evaluation of soiling loss on PV modules based on field measurements is usually a time consuming and expensive undertaking. A laboratory technique using acetonitrile as a carrier solvent is being discussed in the literature. In this work a low-cost artificial dust deposition technique using water as carrier solvent is presented. Dust samples deposited using the two carrier solvents were compared using FTIR analysis, as well as the short circuit current and spectral losses in solar cells overlaid with soiled glass. Acetonitrile is seen to modify the chemical composition of the dust substantially. The uniformity of dust deposited using water is seen to be adequate for systematic analysis of the impact of soiling on PV modules. Acetonitrile based deposition is seen to overestimate the losses.