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The effect of substrate morphology slope distributions on light scattering, nc-Si:H film growth, and solar cell performance.
MedLine Citation:
PMID:  25418361     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Thin-film silicon solar cells are often deposited on textured ZnO substrates. The solar-cell performance is strongly correlated to the substrate morphology, as this morphology determines light scattering, defective-region formation, and crystalline growth of hydrogenated nanocrystalline silicon (nc-Si:H). Our objective is to gain deeper insight in these correlations using the slope distribution, rms roughness (σrms) and correlation length (lc) of textured substrates. A wide range of surface morphologies was obtained by Ar plasma treatment and wet etching of textured and flat-as-deposited ZnO substrates. The σrms, lc and slope distribution were deduced from AFM scans. Especially, the slope distribution of substrates was represented in an efficient way that light scattering and film growth direction can be more directly estimated at the same time. We observed that besides a high σrms, a high slope angle is beneficial to obtain high haze and scattering of light at larger angles, resulting in higher short-circuit current density of nc-Si:H solar cells. However, a high slope angle can also promote the creation of defective regions in nc-Si:H films grown on the substrate. It is also found that the crystalline fraction of nc-Si:H solar cells has a stronger correlation with the slope distributions than with σrms of substrates. In this study, we successfully correlate all these observations with the solar-cell performance by using the slope distribution of substrates.
Authors:
Do Yun Kim; Rudi Santbergen; Klaus Jäger; Martin Sever; Janez Krč; Marko Topič; Simon Hänni; Chao Zhang; Anna Heidt; Matthias Meier; René A C M M van Swaaij; Miro Zeman
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-24
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  ACS Appl Mater Interfaces     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-24     Completed Date:  -     Revised Date:  2014-11-25    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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