17980
Solar cells made out of NG / 4 feature stable and repeatable photocurrent generation during several ' on - off ' cycles of illumination with monochromatic IPCE values of around 1 % .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None