Faculté des sciences

Enhanced optical absorption in microcrystalline silicon

Beck, N. ; Meier, Johannes ; Fric, J. ; Remeš, Z. ; Poruba, A. ; Flückiger, R. ; Pohl, J. ; Shah, Arvind ; Vaněček, Milan

In: Journal of Non-Crystalline Solids, 1996, vol. 198-200, p. 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... Plus

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    Summary
    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.