Module Soiling Spectral and Temperature Effect Comparisons: Focus on CIGSSe, a-SiH, and c-Si

In this paper, we present a simple comparative soiling model to address the questions: What is the controlling parameter of the combination of soiling spectral effects and temperature on low- and higher-bandgap module technologies? What are the ranges that these opposing parameters act to dominate the module output? This paper includea detailed experimental comparisona and validationa for thin-film CIGSSe and thin-film a-Si:H module technologies and extends our previous reports on crystalline Si and thin-film CdTe. We utilize the modeling analysis to also identify regions of "best-of-class" performance for this range of PV absorbers. The spectral effects of accumulated dust layers are characterized for the chemistry/composition and optical transmission and absorption of samples collected from module surfaces in Brazil’s tropical climate region.