Enhanced optical absorption in microcrystalline silicon
Date de parution
Journal of Non-Crystalline Solids, Elsevier, 1996/198-200//903-906
An enhanced optical absorption, compared to crystalline silicon, was observed in the above gap region together with very low defect-connected absorption in microcrystalline silicon (μc-Si:H) prepared by very high frequency glow discharge technique at 70 MHz. As the μc-Si:H material has a very low fraction of amorphous phase, a ‘crystalline silicon like’ absorption model is proposed which associates most absorption properties of μc-Si:H to the crystalline phase in the material. Thereby the influence of internal strain, microcrystalline boundaries, hydrogen content and elastic light scattering on the absorption properties are discussed.
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