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An effective approach is demonstrated for enhancing photoelectric conversion of Cu ( In , Ga ) Se2 ( CIGS ) solar cells with three - dimensional ZnO nanotree arrays .
 Chemical: Cu ( In , Ga ) Se2; Chemical: CIGS; Chemical: ZnO
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: Cu ( In , Ga ) Se2; Chemical: CIGS; Chemical: ZnO