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Particular attention is paid to the development of graphene functionalized with light - harvesting moieties , including materials synthesis , characterization , energy / charge - transfer processes , and applications in photovoltaics .
 Chemical: graphene
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: graphene