25943
A maximum power conversion efficiency of 4 . 46 % has been achieved , which indicated exciting prospects for ZnO nanoparticle based quantum dot - sensitized solar cells .
 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: ZnO