6938
Spectral response data indicated effective minority - carrier diffusion lengths of ~ 1 mu m , which limited the attainable photocurrent densities in the samples to ~ 15 mA cm ( - 2 ) under 100 mW cm ( - 2 ) of Air Mass 1 . 5G illumination .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None