Comprehensive Study of Different PECVD-Deposition Methods for Deposition of Thin Intrinsic Amorphous Silicon for Heterojunction Solar Cells
2009
This work tackles the question whether a soft PECVD-deposition of intrinsic, hydrogenised, amorphous silicon (a-Si:H(i)) is really supportive for the passivation quality of the heterojunction interface between a crystalline wafer and the a-Si:H(i)-layer itself. Two PECVD-deposition methods are under investigation: i) parallel plate 13.5 MHz deposition chamber (PP-13.5 MHz), and ii) an inductively coupled plasma deposition method (ICP). The time dependent degradation and the thickness dependence of the passivation quality of the a-Si:H(i)-layers are discussed as an important fact to note, when the work aims to compare different a-Si:H(i)-layer deposition techniques and/or deposition parameter sets. The two different PECVD a-Si:H(i) deposition techniques are optimized and compared with the goal to find the highest possible passivation quality while reducing the layer thickness below 10 nm.
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