29 Jan '16, 6pm

NREL scientists theorize that certain defects in PV cells may actually improve performance

NREL scientists theorize that certain defects in PV cells may actually improve performance

NREL Theorizes Defects Could Improve Solar Cells January 12, 2016 Schematic of a ‘good’ defect (red cross), which helps collection of electrons from photo-absorber (n-Si), and blocks the holes, hence suppresses carriers recombination. Scientists at the Energy Department's National Renewable Energy Laboratory (NREL) are studying what may seem paradoxical - certain defects in silicon solar cells may actually improve their performance. The findings run counter to conventional wisdom, according to Pauls Stradins, the principal scientist and a project leader of the silicon photovoltaics group at NREL. Deep-level defects frequently hamper the efficiency of solar cells, but NREL theoretical research suggests that defects with properly engineered energy levels can improve carrier collection out of the cell, or improve surface passivation of the absorber layer. Researchers at NREL ...

Full article: http://www.nrel.gov/news/press/2016/21617

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