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In this review we have attempted to survey and compare the recent work on colloidal synthesis , film and nanocrystal composite material fabrication , concentrating on narrow bandgap chalcogenide materials and some of their topical applications in the solar energy and biological fields .
 Chemical: chalcogenide
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: chalcogenide