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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Charged grain boundaries reduce the open-circuit voltage of polycrystalline solar cells-An analytical description.
Journal of Applied Physics 2016 December 22
Analytic expressions are presented for the dark current-voltage relation J ( V ) of a pn + junction with positively charged columnar grain boundaries with high defect density. These expressions apply to non-depleted grains with sufficiently high bulk hole mobilities. The accuracy of the formulas is verified by direct comparison to numerical simulations. Numerical simulations further show that the dark J ( V ) can be used to determine the open-circuit potential V oc of an illuminated junction for a given short-circuit current density J sc . A precise relation between the grain boundary properties and V oc is provided, advancing the understanding of the influence of grain boundaries on the efficiency of thin film polycrystalline photovoltaics like CdTe and Cu(In , Ga)Se2 .
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