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Anomalous temperature dependence of diode saturation currents in polycrystalline silicon thin-film solar cells on glass

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9 Author(s)
Wong, J. ; Photovoltaics Centre of Excellence, The University of New South Wales, Sydney, New South Wales 2052, Australia ; Huang, J.L. ; Kunz, O. ; Ouyang, Z.
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Temperature dependent Suns-Voc measurements are performed on four types of polycrystalline silicon thin-film solar cells on glass substrates, all of which are made by solid phase crystallization/epitaxy of amorphous silicon from plasma enhanced chemical vapor deposition or e-beam evaporation. Under the two-diode model, the diode saturation currents corresponding to n=1 recombination processes for these polycrystalline silicon p-n junction cells follow an Arrhenius law with activation energies about 0.15–0.18 eV lower than that of single-crystal silicon p-n diodes of 1.206 eV, regardless of whether the cells have an n- or p-type base. This discrepancy manifests itself unambiguously in a reduced temperature sensitivity of the open-circuit voltage in thin-film polycrystalline silicon solar cells compared to single-crystal silicon cells with similar voltages. The physical origin of the lowered activation energy is attributed to subgap levels acting either as minority carrier traps or shallow recombination centers.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 10 )