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SEM micrographs of macropores formed in HF solutions containing various types of alcohol. Cross-sectional views of silicon anodized in a 10–20 Ωcm prepatterned p-type silicon at 14 mAcm−2 for 1 h in HF solutions containing (a) MeOH, (b) EtOH, (c) PrOH, and (d) BuOH.
