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This content will become publicly available on June 6, 2017

Title: Pattern Effects of Soil on Photovoltaic Surfaces

The texture or patterning of soil on PV surfaces may influence light capture at various angles of incidence (AOI). Accumulated soil can be considered a microshading element, which changes with respect to AOI. Laboratory deposition of simulated soil was used to prepare test coupons for simultaneous AOI and soiling loss experiments. A mixed solvent deposition technique was used to consistently deposit patterned test soils onto glass slides. Transmission decreased as soil loading and AOI increased. Dense aggregates significantly decreased transmission. But, highly dispersed particles are less prone to secondary scattering, improving overall light collection. In order to test AOI losses on relevant systems, uniform simulated soil coatings were applied to split reference cells to further examine this effect. Finally, the measured optical transmission and area coverage correlated closely to the observed $$I_{{rm SC}}$$. Angular losses were significant at angles as low as 25°.
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2156-3381; 639510
Grant/Contract Number:
Accepted Manuscript
Journal Name:
IEEE Journal of Photovoltaics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2156-3381
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Program (EE-2A)
Country of Publication:
United States
14 SOLAR ENERGY soiling; surface contamination; performance loss; standardized test methods