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Here , we present a detailed studies on a novel growth mode which yields a catalyst - free ( Al , In ) GaAs nanopillar laser on a silicon substrate by metal - organic chemical vapor deposition at the low temperature of 400 degrees C .
 Chemical: Al; Chemical: In; Chemical: GaAs; Chemical: silicon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Al; Chemical: In; Chemical: GaAs; Chemical: silicon