7965
Columnar arrays of anisotropic nano - and microparticles , in which the long axes of the particles are oriented perpendicular to the substrate , are of interest for photovoltaics and other applications .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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