Impact of surface roughness on tracer depth profiling and its implications for Cd109 and Zn65 diffusion experiments in solar-grade Cu(In,Ga)Se2 layers
Impact of surface roughness on tracer depth profiling and its implications for Cd109 and Zn65 diffusion experiments in solar-grade Cu(In,Ga)Se2 layers
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表面粗糙度对示踪剂深度分析的影响及其对太阳能级 Cu(In,Ga)Se2 层中 Cd109 和 Zn65 扩散实验的影响
DOI:
10.1016/j.apsusc.2014.04.050
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发表时间:
2014
影响因子:
6.7
通讯作者:
N.A. Stolwijk
中科院分区:
文献类型:
--
作者:
T. Eschen;K. Hiepko;J. Bastek;N.A. Stolwijk
It is shown by numerical simulation that surface roughness affects the measurement of diffusion profiles by means of serial sectioning techniques. This problem arises in radiotracer diffusion studies of Cd and Zn in thin-film solar-grade Cu (In, Ga) Se 2, which exhibits an appreciable surface roughness due to the special manufacturing process of the polycrystalline layer structure. We find that in unfavorable cases the experimentally determined diffusivity can be significantly higher than the true diffusion coefficient D. This discrepancy appears to increase with the ratio of the surface roughness R rms to the average penetration depth 2 Dt attained after a diffusion time t. It can be concluded, however, that the employed ion-beam sputtering technique, which involves rotation of the Cu (In, Ga) Se 2 diffusion sample, usually leads to experimental errors of∼ 10% or less. The results of this study may be also relevant to other depth profiling techniques such as secondary ion mass spectrometry.
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DOI:
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期刊:
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影响因子:
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DOI:
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发表时间:
2008
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Materials Science Forum
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